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1. Main Control Unit, two-channel electrometer and servo controller.

2. This application employs a Model 6517A Electrometer, which can supply the test voltage and measure the residual voltage.

3. When in the external feedback mode, the electrometer will display the voltage across the feedback element. The unknown charge can be calculated from the following formula.

4. Using with a vibrating capacitor electrometer and a digital voltmeter, the stability is better than 0.1%.

5. The circuit of the electrometer when used as a voltmeter actually as shown in Figure 2 - 6 .

6. Connect an electrometer to the switch card output and measure the cur - rent.

7. The forward-biased diode in series with the HI electrometer (pA) terminal also serves to limit the AC gain.

8. These cables are excellent for general-purpose electrometer work because the surface leakage in this application is relatively unimportant.

9. An electrometer makes an ideal coulombmeter because it has very low input offset current and high input resistance.

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10. The ohmmeter uses an internal current source and electrometer voltmeter to make the measurement.

11. The Model 6517 A Electrometer has the Alternating Polarity Method built into a test sequence.

12. VC type electrometer is an electrostatic instrument of alternating current induction type.

13. Charge measurements made with an electrometer are subject to a number of error sources, including input offset current, voltage burden, generated currents, and low source impedance.

14. The guard terminal of the electrometer ammeter or picoammeter is the LO input terminal.

15. This can be checked by observing the analog output of the electrometer or picoammeter with oscilloscope.

16. Figure 1 - 26 is a block diagram of a typical digital electrometer.

17. More information on the measurement procedure can be found in the instruction manual of the electrometer.

18. Given that the offset current may be hundreds of picoamps or less, an electrometer or picoammeter is required to measure it.

19. Usually, this method requires two instruments: a voltage source and a picoammeter or electrometer.

20. As illustrated in Figure 2-38, an external feedback capacitor is placed between the preamp output terminal and the HI input terminal of the electrometer.

21. The external feedback mode allows an external device to be used as the feedback element of the electrometer.

22. Figure 5 - 7 a shows a high impedance voltage con - nected through a switch to an electrometer voltmeter.

23. The damping circuit may already be built into the electrometer or may be an external circuit.

24. To measure the offset current, close a specific crosspoint and use an electrometer or SMU to measure the current with everything in place except the device under test.

25. The basic configuration of the constant-voltage method using an electrometer or picoammeter is shown in Figure 2-30a.

26. Because of the high input resistance and low offset current, the electrometer voltmeter has minimal effect on the circuit being measured.

27. The most effective method of minimizing input capacitance is to connect the electrometer, SMU, or picoammeter to the signal source with a shielded cable that is as short as possible.

28. Figure 4 - 2 illustrates the basic circuit that uses an electrometer to determine dielectric absorption.

29. Figure 1 - 18 shows the basic configuration of an alternative form of electrometer ohmmeter.

30. The basic configuration of the constant - voltage method using electrometer or picoammeter is shown in Figure 2 - 30 a.