Hameg HM5010-5011 Spectrum Analyzer - Service manual 电路图.pdf

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1、 Instruments Spectrum analyzer HM5011 HM5010 ENGLISH 4S-5010-0010 09 JUN 1998 SERVICE-MANUAL HM5011/5010 RadioFans.CN 收音机爱 好者资料库 2 Subject to change without notice HM5010/5011 Service Manual Adjustment Procedure Circuit Diagrams Alignment Procedure for HM5010/HM 5011 . 5 AControl and Adjustment of S

2、upply Voltages. 5 BFinal Alignment - Tuner. 6 CAlignment - IF-Unit . 6 DLinearity of Frequency Display . 7 HM5010 XY-board . 10 Tuner . 11 Tracking-Generator . 12 EAlignment of HM5011 Tracking Generator. 13 Tracking-Generator . 15 Tuner RA-Board . 16 Tuner RB-Board . 17 IF-Amplifier . 18 Main board

3、. 19 X-Y Board . 20 FC-Board . 21 PA-Board . 22 CRT-Board . 23 Power supply Board . 24 RA-Board . 25 Tracking-Generator . 26 RB-Board . 27 Main board . 28 Main board . 29 XY-Board. 30 XY-Board. 31 FC-Board . 32 FC-Board . 33 PA-Board . 34 CRT-Board . 35 PS-Board . 36 PS-Board . 37 PS-Board . 38 Bloc

4、k Diagram HM5010/HM5011 . 39 RadioFans.CN 收音机爱 好者资料库 Subject to change without notice 3 SPECTRUM ANALYZER This HO500 computer interface offers the facility to transfer a calibrated frequency spectrum from any HAMEG spectrum analyzer to a PC. The HO500 interface is a 8 bit ISA BUS card installed in t

5、he PC, which transfers data via an interface cable. The software supplied allows a hard copy print out (including parameters) of the frequency spectrum, in Windows Format. Signal aquisition occurs 2 to 3 times per second. The picture consists of 10 bit vertical by approx 3600 point horizontal displa

6、y. The PC monitor display is in SVGA Format with 800 x 600 pixels. For comparison measurements, a previosly stored reference curve can be recalled. The software supplied works under Windows 3.1, 3.11 and WIN95. A simple XY analog output is required to connect the HO500 to the spectrum analyzer. HO50

7、0 Computer Interface for HAMEG Spectrum Analyzer Frequency Range 0.15MHz - 1050MHz. 4 Digit Display (Center Video-Filter on: 4kHz Sweep rate: 43Hz Amplitude Amplitude range: -100dBm to +13dBm Screen display range: 80dB (10dB / div.) Reference level: -27dBm to +13dBm (in 10dB steps) Reference level a

8、ccuracy: 2dB Average noise level: -99dBm (20kHz BW) Distortion: 3MHz apart) Sensitivity: 5dB above average noise level Log scale fidelity: 2dB (without attn.) Ref.: 250MHz IF gain: 10dB adjustment range Input Input impedance: 50 Input connector: BNC Input attenuator: 0 to 40 dB (4 x 10dB steps) Inpu

9、t attenuator accuracy: 1dB/10dB step Max. input level: +10dBm, 25VDC (0dB attenuation) +20dBm (40dB attenuation) Tracking Generator Output level range: -50dBm to +1dBm (in 10dB steps and var.) Output attenuator: 0 to 40dB (4 x 10dB steps) Output attenuator accuracy: 1dB Output impedance: 50 (BNC) Fr

10、equency range: 0.15MHz to 1050MHz Frequency response: 1.5dB Radio Frequency Interference (RFI): 8 General Display: CRT. 6 inch, 8 x 10 div. intern. graticule Trace rotation: Adjustable on front panel Line voltage: 115 / 230V 10%, 50-60Hz Power consumption: approx. 20W Operating ambient temperature:

11、0C.+40C Protective system: Safety Class I (IEC 1010-1) Weight: approx. 7kg Cabinet: W 285, H 125, D 380 mm Subject to change without notice5/96 Spectrum Analyzer HM5010 / HM5011 Accessories supplied: Line Cord, Operators Manual. Optional accessories, 50 -feedthrough termination HZ22 Viewing Hood HZ4

12、7, Near Field Probe Set HZ530, Carrying Case HZ96-2, Transient Limiter HZ560 RadioFans.CN 收音机爱 好者资料库 4 Subject to change without notice The HZ530 is the ideal toolkit for the investigation of RF electromagnetic fields. It is indispensable for EMI pre- compliance testing during product development, p

13、rior to third party testing. The set includes 3 hand-held probes with a built-in pre-amplifier covering the frequency range from 100kHz to over 1000 MHz. The probes - one magnetic field probe, one electric field probe, and one high impedance probe - are all matched to the 50 inputs of spectrum analy

14、zers or RF- receivers. The power can be supplied either from batteries, Ni-Cads or through a power cord directly connected to an HM5010/HM5011 series spectrum analyzer. Signal feed is via a 1.5m BNC-cable. When used in conjuction with a spectrum analyzer or a measuring receiver, the probes can be us

15、ed to locate and qualify EMI sources, as well as evaluate EMC problems at the breadboard and prototype level. They enable the user to evaluate radiated fields and perform shield effectiveness comparisons. Mechanical screening performance and immunity tests on cables and components are easily perform

16、ed. The H-Field Near-Field Probe The H-Field probe provides a voltage to the connected measurement system which is proportional to the magnetic radio frequency (RF) field strength existing at the probe location. With this probe, circuit RF sources may be localized in close proximity of each other. T

17、he H-field will decrease as the cube of the distance from the source. A doubling of the distance will reduce the H- field by a factor of eight (H = 1/d); where d is the distance. In the actual use of the H-field sensor one observes therefore a rapid increase of the probes output voltage as the inter

18、ference source is approached. While investigating a circuit board, the sources are immediately obvious. It is easily noticed which component (i.e. IC) causes interference and which does not. In addition, by use of a spectrum analyzer, the maximum amplitude as a function of frequency is easily identi

19、fied. Therefore, one can eliminate early in the development com- ponents which are not suitable for EMC purposes. The effectiveness of countermeas- ures can be judged easily. One can inves- tigate shields for leaking areas and cables or wires for conducted interference. The High-Impedance Probe The

20、high-impedance probe (Hi-Z) permits the determination of the radio frequency interference (RFI) on individual contacts or printed circuit traces. It is a direct-contact probe. The probe is of very high impedance Specifications Frequency Frequency range:0.1MHz to 1000MHz (lower frequency limit depend

21、s on probe type) Output impedance:50 Output connector: BNC-jack Input capacitance: 2pF (high imped. probe) Max. Input Level:+10dBm (without destruction) 1dB-compression point: -2dBm (frequency range dependent) DC-input voltage:20V max. Supply Voltage:6V DC 4 AA size batteries Supply-power of HM5010/

22、5011 Near Field Sniffer Probes HZ530 Supply Current:8mA (H-Field Probe) 15mA (E-FieldProbe) 24mA(High imp.Probe) Probe Dimensions:40 x19x195mm (WxDxL) Housing:Plastic; (electrically shielded internally) Package contents: Carrying case 1 H-Field Probe 1 E-Field Probe 1 High Impedance Probe 1 BNC cabl

23、e (1.5m) 1 Power Supply Cable (Batteries or Ni-Cads are not included) (near the insulation resistance of the printed circuit material) and is loading the test point with only 2 pF (80 at 1 GHz). Thereby one can measure directly in a circuit without significantly influencing the relationships in the

24、circuit with the probe. One can, for example, measure the quan- titative effectiveness of filters or other blocking measures. Individual pins of ICs can be identified as RFI sources. On printed circuit boards, individual problem tracks can be identified. With this Hi-Z probe individual test points o

25、f a circuit can be connected to the 50 impedance of a spectrum analyzer. The E-Field Monopole Probe The E-field monopole probe has the highest sensitivity of the three probes. It is sensitive enough to be used as an antenna for radio or TV reception. With this probe the entire radiation from a circu

26、it or an equipment can be measured. It is used, to determine the effectiveness of shielding measures. With this probe, the entire effectiveness of filters can be measured by measuring the RFI which is conducted along cables that leave the equip- ment and may influence the total radiation. In additio

27、n, the E-field probe may be used to perform relative measurements for certi- fication tests. This makes it possible to apply remedial suppresion measures so that any re- qualification results will be positive. In addition, pre-testing for certification tests may be per- formed so that no surprises a

28、re encountered during the certification tests. SCALE = 10dB/DIV. SCALE = 10dB/DIV. Frequency Response E-Field Probe (typical)Frequency Response H-Field Probe (typical) SCALE = 10dB/DIV. Frequency Response High Impedance Probe (typical) EMC-MEASUREMENT EQUIPMENT Subject to change without notice 5 Att

29、ention! The opening of covers or removal of parts is likely to expose live parts and accessible terminals which can be dangerous to life. Maintenance, service and alignment should be carried out by qualified personnel only, which is acquainted with the danger involved. When aligning the HM5010/5011

30、it is assumed that all sub-assemblies of the instrument are completely pretested and working correctly. The tuner, IF-unit, and tracking generator should be pre-aligned. When aligning a HM5010, a separate tracking generator unit must be available and connected to the HM5010 for some specific adjustm

31、ents. Prior to the alignment procedure, the instrument must warm up for 60 minutes. All adjustments are carried out by means of a plastic screw driver or a ceramic adjustment tool. The alignment is divided into the following steps: A Checking of supply voltagesD Linearity alignment B Alignment of th

32、e tunerETracking generator alignment C Alignment of the IF-unitFCheck of overall adjustment The numbering system is related to the respective pictures. Screen shots are designated as PIC 1HF-Synthesizer 100 kHz to 1000 MHz, i.e. HM 8133 2BNC cable, BNC T-connector, 2 x 10dB attenuator 50 Ohm 1Voltme

33、ter i.e. HM 8011-3 AControl and Adjustment of Supply Voltages adjust:12V to an accuracy of 0.1Vvia Trimpot 4PIC 1 adjust:minimum brightnessvia Trimpot 2PIC 1 adjust:maximum brightnessvia Trimpot 3 PIC 1 adjust:astigmatismvia Trimpot 1PIC 1 check:12Vtolerance 0.2V check:+12Vtolerance 0.1V check:+5Vto

34、lerance 0.2V check:5Vtolerance 0.2V check:+38Vtolerance 1V check:+138Vtolerance 1V 4 CRT-BoardPIC 1. PS-Board Instrument Rear Side 321 1+138V 2+38V 3GND 4+5V 5+12V 6-12V 1 PIC 2. XYF-Board (partial) 1 The corresponding voltage test points to check direct voltage can be measured at the measuring conn

35、ector strip (see PIC 2). Basic adjustment: When Y-pos. knob is snapped in on front board, adjust beam approx. 2 mm below bottom graticule line via R801. Alignment Procedure for HM5010/HM 5011 6 Subject to change without notice fig. 22 for HM5010 L 11 L 10 L 12 L 8 L 7 L 9 L 13 L 14 L 4 L 3 L 1 VR 3

36、VR 4VR 2 VR 1 PIC 5 IF-Amp Board BFinal Adjustment - Tuner The tuner is already aligned by the factory. When changing the 1st mixer, it might be necessary to realign cavity filter: Set signal to 500MHz -27dBm to input, center frequency to 500MHz, Scanwidth to 0.5MHz, turn all three M3 screws to max.

37、 amplitude. In case curve is not uniform, coils L1, L2, and L3 can be adjusted to maximum uniformity (fig. 22) by slightly bending them. In case signal in frequency range is shacky, 2nd local oscillator might not be snapped in correctly. The correct snap- in of the PLL is visible via the lock detect

38、 LED (D2), which has to be lit constantly without flickering if PLL is snapped- in correctly. The oscillator signal has to be fixed (crystal dependent) at 1.32GHz, it may not drift. The PLL is snapped-in when the tuning voltage VT (measure at PAD1) is between 0.5 and 4.5V. The alignment will bring t

39、he tuning voltage to the center of the tuning range. VT of the 2nd LO has to be between 2V and 2.5V. Constantly check tuning voltage while aligning tuner. Alignment is necessary in two cases: VT2.5V. Case 1 VT2.5V Correction: a) Adjustment areas may not be soldered to connect trace from C1 to C2. b)

40、 Add solder to resonator pad. CAlignment of IF-Unit Measurement setup: Apply two different signals to the input of the HM5011 via BNC T-connector and 10dB attenuators. Adjust HM5010/5011: Center frequency to 500MHz; all attenuators on (40 dB) Bandwidth 400kHz; video filter off; scanwidth 0.5MHz/div.

41、; marker off. Adjust Tracking Generator: Attenuator 20dB; level max. (HM5011 only) RF-generator: frequency 500MHz; level 5dBm The output voltage of the tracking generator is visible on the screen by an overlay of the fixed frequency. A zero point is visible within the signal to the right or to the l

42、eft of the 500MHz spectral line (fig. 23fig. 23fig. 23fig. 23fig. 23) (5011 only). IF Filter Curve at 400kHz Bandwidth align:Step 1Align (with plastic screw driver) Coil L1 (PIC 5) to maximum output amplitude and symmetry to Y-axis. align:Step 2Align (with plastic screw driver) Coils 3 + 4 + 13 + 14

43、 (PIC 5) to symmetrie to Y-axis. The zero point must be at the maximum (at 500MHz) (fig.fig.fig.fig.fig. 23). align:Stept 3If necessary, repeat step 1 and 2. fig. 23 for HM5011 Subject to change without notice 7 IF Filter Curve at 20kHz Bandwidth (HM5010) align:Step 1Align (with plastic screw driver

44、) Coils L7+8+9+10+11+12 until zero point is exactly centered at 500MHz (as with 400kHz Bandwidth). Watch for symmetry of Filter Curve. IF Filter Curve at 20kHz Bandwidth (HM5011) Pre-Alignment: Remove T-connector. Connect tracking generator module directly to the input of the HM5011. Turn off attenuators