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1、Manual Part Number:20790 Revision Level: C Configuration Code:27 Print Date:November 1998 Operation Model 8502A has dual detector inputs for making ratio measurements. All technical and operation descriptions in this manual apply equally to both models unless otherwise stated. Performance specificat

2、ions for the Series 8500A are in Sectio n 1.2. Detector specifications are contained in Appendix D. Options, if any will be detailed in Appendix E. Power requirements are 100/120/220/240 Vac 10%, 48-400 Hz. See Section 2.2 for Safety Precautions and details to set the voltage and install the correct

3、 fuse for the area in which the instrument will be used. Series 8500A Peak Power Meters 1-2Manual 20790, Rev. C, November 1998 1.1.1Environmental Requirements Series 8500A power meters are type tested to MIL-T-28800E, Type III, Class 5, Style E for Navy shipboard, submarine, and shore applications e

4、xcept as follows: Operating temperature range is 0 C to 50 C (calibrator operating temperature range is 5 C to 35 C). Non-operating (storage) temperature range is -4 0C to +7 0C. Relative humidity is limited to 95% non-condensing. Altitude and EMI requirements are not specified. 1.1.2Items Furnished

5、 In addition to options and/or accessories specifically ordered, items furnished with the instrument are: 1 ea. - Power Cord 1 ea. - Detachable Detector Cable (for Model 8501A), or 2 ea. - Detachable Detector Cables (for Model 8502A) 1 ea. - Operation and Maintenance Manual 1.1.3Items Required The 8

6、500A requires an external power detector; see Appendix D for power detector specifications. 1.1.4Tools and Test Equipment No special tools are required to operate the Series 8500A. Test equipment required for calibration or performance verification is described in Chapter 4. 1.1.5Cooling No cooling

7、is required if the instrument is operated within its specified operating temperature range (0 to 50 C). 1.1.6Cleaning The front panel can be cleaned using a cloth dampened with a mild detergent; wipe off the detergent residue with a damp cloth and dry with a dry cloth. Solvents and abrasive cleaners

8、 should not be used. 1.1.7Receiving Inspection Use care in removing the instrument from the carton and check immediately for physical damage, such as bent or broken connectors on the front and rear panels, dents or scratches on the panels, broken extractor handles, etc. Check the shipping carton for

9、 evidence of physical damage and immediately report any damage to the shipping carrier. Each Giga-tronics instrument must pass rigorous inspections and tests prior to shipment. Upon receipt, its performance should be verified to ensure that operation has not been impaired during shipment. The perfor

10、mance verification procedure is described in Chapter 5 of this manual. Introduction Manual 20790, Rev. C, November 1998 1-3 1.1.8Returning an Instrument If you are returning an instrument to Giga-tronics for any reason, including service, first contact Giga-tronics Customer Service at (800) 444-2878

11、 or Fax at (925) 328-4702 so that a return authorization number can be assigned. You can also contact Customer Service over their e-mail address . To protect the instrument during reshipment, use the best packaging materials available. If possible use the original shipping container. If this is not

12、possible, a strong carton or a wooden box should be used. Wrap the instrument in heavy paper or plastic before placing it in the shipping container. Completely fill the areas on all sides of the instrument with packaging material. Take extra precautions to protect the front and rear panels. Seal the

13、 package with strong tape or metal bands. Mark the outside of the package “FRAGILE DELICATE INSTRUMENT”. If corresponding with the factory or local Giga-tronics sales office regarding reshipment, please reference the full model number and serial number. If the instrument is being reshipped for repai

14、r, enclose all available pertinent data regarding the problem that has been found. Series 8500A Peak Power Meters 1-4Manual 20790, Rev. C, November 1998 1.2System Specifications Frequency Range30 MHz to 40 GHz depending on detectors (See the Detector Specifications in Appendix D) Power Range(Direct

15、input to detector): PulseMode:-20 to +20 dBm CW Mode:-40 to +20 dBm Absolute Maximum Limit:+23 dBm (200 mW) AccuracyThe uncertainty of microwave power measurements depends on several factors, the most important is the effective mismatch of both the power detector and the RF source. Excluding mismatc

16、h effects, the measurement uncertainties of the instrument and its power detectors are as follows: Calibrator Power Uncertainty (at 0 dBm):1.5% (0.065 dBm) Linearity after Automatic Calibration:3% (at stable temperature) Temperature coefficient of linearity at ambien t5 C, CW and Peak, typical:-10 d

17、Bm negligible, 0 to 50 C -10 dBm 0.5%/deg.C, 15 to 50 C 1.0%/deg.C, 0 to 15 C (The instrument indicates if the 5 C calibration range is exceeded) Uncertainty (due to zeroing and noise):CW: 10 nW, 15 to 50 C (Avg. = 500) 20 nW, 0 to 15 C Peak: 3.5 mW, 15 to 50 C (Avg. = 100) 5.0 mW, 0 to 15 C Single

18、Pulse:15 mW, 15 to 50 C (typical) 2 dB and 20 dB below the peak level of the signal. Duty Cycle:50% Trigger Rate:10 Hz to 10 MHz External:TTL levels, Max PRF = 1 MHz Graph Display ModePlots the outline of the detected pulse on the EL display. Also provides readout of amplitude and timing information

19、. Fast Measurement ModeAvailable under GPIB control to provide fast data acquisition and output. For an averaging number = 1, typically will be between 70 and 120 measurements/second. Also can be used to provide fast data acquisition and throughput via a rear panel analog output for using an 8500A w

20、ith a network analyzer to make swept frequency response tests. Calibrator Specifications Frequency:1 GHz 5% Power Uncertainty at 1mW:1.5% Return Loss at 1 mW:Greater than 25 dB Self Calibration Time:Less than 1 minute Connector:Type N Series 8500A Peak Power Meters 1-6Manual 20790, Rev. C, November

21、1998 Auxiliary Inputs/Outputs Monitor:Provides a voltage proportional to the detected RF envelope. Rise time is typically 20 ns, output impedance is nominally 50 ohms. Analog Output Coefficient:100 mV/dB 0.5 mV (0 V = 0 dBm) Offset:10 mV Trigger Input:TTL RF Blanking:TTL open collector low during ze

22、roing. Used to control power source. VPROPF:(V/GHz) Allows direct entry of frequency from RF power sources equipped with a VpropF output. GPIB Interface:Per IEEE STD 488-1978 GPIB Indicators:REM, TLK, LSN, SRQ, LLO Remote OperationComplete setup and measurement capabilities accessible via GPIB (IEEE

23、 488). Reporting of errors, malfunctions, operational status, and self-test diagnostics available through serial poll capability. Direct Plot Output:Outputs hardcopy pulse profile plots, with time, date and part identification, to a GPIB plotter. GPIB Address:Selectable from front panel IEEE Interfa

24、ce Functions:SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, TE0, LE0 General Specifications Stored Setups:Saves settings at power down, and has 10 additional setups in non-volatile memory. Power-On Self-Test (POST):POST is optionally performed at any time. A diagnostic code indicates the cause and locat

25、ion of any errors. Reset Control (rear panel):Returns the instrument to preset (default) condition. Design and Construction:To the intent of MIL-T-28800C, Type III, Class 5, Style E or F, Color R Power Requirements:100, 120, 220, or 240 Vac 10%, 50, 60, or 400 Hz 5% Power Consumption:Approximately 1

26、00 VA Operating Temperature:0 to 50 C (32 to 122 F) Non-operating Temperature:-40 to +65 C (-40 to +149 F) Introduction Manual 20790, Rev. C, November 1998 1-7 Operating Humidity (without precipitation):95%, 5% to 30 C 75%, 5% to 40 C 45%, 5% to 50 C Dimensions: Bench Mount:With Feet:148.3 x 425.7 x

27、 355.6 mm(5.84 x 16.76 x 14.00 in.) Without Feet:132.6 x 425.7 x 355.6 mm(5.22 x 16.76 x 14.00 in.) Rack Mount:132.6 x 482.6 x 355.6 mm (5.22 x 19.00 x 14.00 in.) Conforms to EIA RS-310 Standard for a 19-inch rack. Weight:Model 8501A:12 kg (26 lbs) Model 8502A:13 kg (28 lbs) Depending upon requireme

28、nts, the following software versions and enhancements apply (See Table 1-1). Table 1-1: 8500A Functions Related to Software Versions S/W VersionSound WorksFast Analog S-Mode (FAA) Menu Wrap 2.10AYES 2.11A 2.13AYESYES 2.14AYESYESYES Series 8500A Peak Power Meters 1-8 Manual 20790, Rev. C, November 19

29、98 1.3Default Settings Factory-programmed settings of various user definable functions have the following defaults whenever there have been no changes made in the settings by the operator during any testing routines. The following settings are not affected by power-on, initialization, and setup stor

30、e or recall: FunctionDefault Setting AveragingCW: 4 samples; Peak: 4 samples Internal Trigger Level (A the appropriate voltage should be visible through the window (see Figure 2-3). To replace the fuse: With the housing cover open, pull out the small drawer on the right side of the housing (marked w

31、ith an arrow) and remove the old fuse. Replace with a new fuse, insert the drawer and close the housing cover (see Figure 2-3). Figure 2-3. VDE Voltage Selector and Fuse Holder Series 8500A Peak Power Meters 2-4Manual No. 20790, Rev C, November 1998 2.3Rear Panel Description The Series 8500A power m

32、eter rear panel controls and interface connections are described in this section. The boxed numbers in the diagram correspond to the boxed numbers in the description. The Model 8501A will have single-channel inputs while Model 8502A will have Channel A and Channel B inputs as shown in Figure 2-4. 1I

33、nput Power and FuseRefer to Section 2.2 for the details to select the correct input voltage and fuse. 2Monitor OutputThis output connection interconnects to a test instrument such as an oscilloscope to externally monitor the detected signals entering the PPM. The Model 8502A has a monitor input for

34、Channel A and Channel B. 3Analog OutputThis connector outputs 100 mV/dB signal to interface the PPM with the Giga-tronics Model 8003 Precision Scalar Analyzer for making swept peak power measurements (see Measuring Peak Power Under Swept Conditions in Section 2.14). The Model 8502A has an analog inp

35、ut for Channel A and Channel B. CAUTION When using the PPM in the 1018B Emulation Mode, it should be kept in mind that the 1018B instrument has a 10 mV/dB analog output while the PPM has 100 mV/dB. If the 10 mV/dB output of the 1018B is required, a 10:1 resistive divider network should be employed t

36、o reduce the PPMs 100 mV/dB output. Figure 2-4. Model 8502A Rear Panel Operation Manual No. 20790, Rev C, November 19982-5 4Detector InputThese channel A and B inputs (single input in the 8501A) will be hole cover plates unless Option 03 (Rear Panel Connection) has been ordered. With Option 03, the

37、Detector Input and Calibrator will be relocated from the front to the rear panel. The Calibrator connection will be above the Serial/Code number label on the right side of the rear panel. 5GPIB InterfaceThis is the interface connection for controlling the instrument through the GPIB (IEEE bus). 6FRE

38、Q InputThis is the voltage-proportional-to-frequency (VpropF) input connection that receives the Frequency Reference or V/GHz (V F) output signal from an external signal generator. This signal provides frequency information to the PPM for detector frequency response correction when required. 7TRIG I

39、nput - TTL This connection interfaces a TTL signal source to provide an external trigger when this mode of operation is selected. 8SYNC OutputThis output connection provides access to the sample pulse for synchronizing the PPM to an external counter. 9RF Blanking Output - TTL This output interfaces

40、a blanking TTL signal to turn off the external RF power signal source when you want to autozero or calibrate the detectors. It is at a TTL high level during execution of these functions. 10ResetThis control resets the PPM to its initial power-on condition without having to turn off the instrument. 1

41、1Volume ControlThis control adjusts the volume level of the audio tones generated by the PPM. The audio can be turned off with this control. Series 8500A Peak Power Meters 2-6Manual No. 20790, Rev C, November 1998 2.4Front Panel Description The front panel controls, display, and connections are desc

42、ribed in this section. The boxed numbers in Figure 2-5 correspond to the boxed numbers in the description. The Peak, CW, and Graph keys in both power meter models, and the Detector Select A and B keys of the Model 8502A contain lights in the center of the buttons to indicate when the functions are a

43、ctive. 1PowerThis is the push-on push-off ac power switch to the PPM. 2DisplayThis is an Electro Luminescent (EL) alphanumeric and graphic display screen. It presents data and shows pulse waveform profiles. 3GPIB Indicators These LEDs indicate whether the PPM is under local or remote control and the

44、 current GPIB status (REM = remote control on, LSN = listen, TLK = talk, SRQ = service request, and LLO = local lockout.) 4F1, F2, F3 Directional keys Backspace The F1 (up) and F2 (down) directional keys are used in the Graph Mode to move the cursor ( icon) up and down to select any pulse or cursor

45、parameters that are to be changed. The F3 (backspace) key is for correcting entered text or numbers. A secondary function of these keys is to select menu functions as the various menus are displayed. 5Ready, New Data Indicators These LEDs flash whenever the system is receiving a trigger. If the Read

46、y light is steadily on and the New Data light is off, it would indicate that a trigger was not being received. 6Data EntryUse this 12-button keypad to enter parameter data when instructed in the applicable procedure. P e a k P o w e r M e terModel 8502A 78 9 1 0 . _ ns m s s Clear F1F2 F3 23 456 GHz

47、 kW dBW dBm mW On Off LL0 GPIB REM SRQ LSN TLK Ready New Data Pulse/ CursorMemFreqMenu Detector Select A B PeakCW Graph Autoscale D e t e c t o r I n p u t A B Calibrator 1 GHz ? ? Bksp 2 678 1317 10111215 16 14 34591 Figure 2-5. Model 8502A Front Panel Operation Manual No. 20790, Rev C, November 19

48、982-7 7ClearThe CLEAR key exits from a menu, but it clears erroneous entries while entering data. 8Units: ns/dBm mWThis key enters pulse timing parameters in nanoseconds. The dBm mW function enters a power parameter in either dBm or milliwatts. s/dB W This key enters pulse timing parameters in micro

49、seconds. The dB W function enters a power parameter in either dB or Watts. ms/GHz kWThis key enters pulse timing parameters in milliseconds. The GHz kW function enters a frequency in GHz or (with offsets) a power parameter in kilowatts. NOTE: Each of the unit keys have a secondary function. At various points in these instructions, the procedures will state to press any units key. This is to enter a parameter without units (average number), to enter units other than those listed above (start voltage), or to start a function. 9Pulse/Cursor/ Marker