1412 电路图.pdf

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1、Figure 1 The double shielding used in the 1412-BC Decade Capacitor keeps CHG very small. This capacitance is the diff erence between the 3-terminal and 2-terminal capacitance of the box; CLG is approx. 125 pF. 534 Main Street, Westbury, NY 11590 IET LABS, INC. in the GenRad T TEL: (516) 334-5959 (80

2、0) 899-8438 FAX: (516) 334-5988 Contents p. 2 Applic. pp. 4-8 Selection pp. 9-11 Products pp. 12-87 GenRad prod ucts pp. 50-87 Index p. 89 60 Verifi cation of calibration of LCR meters Capacitance measurement functions Verifi cation of calibration of multimeters For calibrating instrumentation 50 pF

3、 to 1 F Better than 1 pF resolution Accuracy of (0.5% + 5 pF) Low loss, leakage, dielectric absorption Stable Polystyrene Decade Capacitor Electronic cat/1482/09-15-03 Model 1412-BC: The wide capacitance range and high resolution of this decade capaci- tance box make it exceptionally useful in both

4、laboratory and test shop. Owing to its fi ne adjustment of capacitance, it is a convenient variable capacitor to use with an impedance comparator. The polystyrene dielectric used in the decade steps is necessary for applica- tions requiring low dielectric absorption and constancy of both capacitance

5、 and dissipation factor with frequency. Model 1412-BC Decade Capacitor For decades of polystyrene capacitors and a variable air capacitors are used, mounted in a double-shield box. The double shielding provides 2-terminal and 3-terminal capacitance s that are the same except for the capacitance betw

6、een the terminals. The variable air capacitor with a linear C of 100 pF and a resolution of better than 1 pF provides continuous adjustment between the 100 pF steps of the smallest decade. 1412 Series1412 Series p. 1 of 2 RadioFans.CN 收音机爱 好者资料库 ORDERING INFORMATION 1412-9410 1412-BC Decade Capacito

7、r Capacitance: 50 pF to 1.11115 F in steps of 100 pF with a 0 to 100 pF variable air capacitor providing continuous adjustment with divisions of 1 pF. Capacitance for 2- and 3-terminal connections dif- fer by about 1 pF (CHG in Figure 1) CLC is approximately 125 pF. Minimum Capacitance: 50 pF with a

8、ll controls set at zero. Dielectric: Polystyrene for decade steps. Accuracy: ( 0.5% + 5 pF) at 1 kHz for total capacitance including 50 pF minimum for the 3-terminal connection. Temperature Coeffi cient of Capacitance: -140 ppm/C (nominal). Frequency Characteristics: DC Cap/ 1 kHz Cap 1.001. At high

9、er frequencies the increase is approximately C/C = (f /f r). The resonant frequency, f r, varies from over 400 kHz for a capacitance of 1 F to 27 MHz for a capacitance of 150 pF when connections are made to the front terminals. f r is about 300 kHz and 70 MHz for rear connections and the same capaci

10、tance. Max Operating Temperature: 65C. Dielectric Absorption: (Voltage Recovery): 0.1% max. Dissipation Factor: 150 to 1000 pF, 0.001 max, at 1 kHz; over 1000 pF, 0.0002 max, at 1 kHz. Insulation Resistance: 1012 min. Max Voltage: 500V peak, up to 35 kHz. Terminals: Four bindings posts with groundin

11、g link are provided on the front panel. Two of the binding posts are connected to the case and located for convenient use with patch cords in 3-terminal applications. Access is also provided to rear terminals for relay-rack application. Mechanical: Lab-bench cabinet; brackets provided for rack mount

12、. Dimensions: 0.89 cm H x 43.9 cm W x 15.3 cm D (3.5 x 17.25 x 3.5) Weight: 3.9 kg (8.5 lb.) net, 4.6 kg (10 lb.) shipping. SPECIFICATIONS 534 Main Street, Westbury, NY 11590 IET LABS, INC. in the GenRad T TEL: (516) 334-5959 (800) 899-8438 FAX: (516) 334-5988 Con tents p. 2 Applic. pp. 4-8 Selection pp. 9-11 Products pp. 12-87 GenRad prod ucts pp. 50-87 Index p. 89 61 1412 Series1412 Series p. 2 of 2 Stable Polystyrene Decade Capacitor RadioFans.CN 收音机爱 好者资料库