electrometer

The measured current is usually quite small, so a picoammeter or electrometer is often required to make the measurement.

To measure the offset of a switch card, connect the output of the card to a pico ammeter or electrometer.

Figure 2-39 shows an electrometer connected to a current source that consists of a voltage source in series with a resistor.

Refer to the electrometer's manual or specifications for the value of the feedback impedance for a particular instrument.

When a charged object is placed within the inside electrode, an induced charge will flow into the electrometer.

Quartz has properties similar to sapphire, but considerably higher piezoelectric output, so it's rarely used in electrometer circuits.

Connect the HI terminal of the electrometer to one end of the resistor and the HI of the voltage source to the other end.

These low current measurements are often made with an electrometer or source-measure unit.

The resistors (RL) are current limiting resistors used to protect the switches and electrometer from high current.

Since the voltage burden of the electrometer ammeter or picoammeter is less than 1mV, the diodes won't conduct.

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

As shown in Figure 2 - 40, this will cause a current (i) to flow through the low to ground capacitance of the electrometer (IM).

Two general types of connectors are used for electrometer, picoammeter, and SMU measurements.

The electrometer ohmmeter makes a two-wire resistance measurement at a specific test current, depending on the measurement range.

General Electrometer Considerations: A discussion of techniques and error sources that affect high impedance measurements in general.

The following paragraphs examine considerations that apply to all types of electrometer and SMU measurements on high resistance sources.

This can be done by placing the object in a Faraday cup and measuring the charge with an electrometer .

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

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

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

To avoid measurement errors, it's critical to make proper connections from the electrometer, SMU, or picoammeter to the device under test.

Refer to the instrument's instruction manual for information on a particular electrometer 's internal damping feature.

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

The inside electrode is connected to the electrometer HI and the outside electrode is connected to the electrometer LO.

Picoammeters and SMUs also have very low input bias currents, although usually not as low as an electrometer 's.

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

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

Figure 2-24 shows a protection circuit for an electrometer ammeter or picoammeter, consisting of a resistor and two diodes (1N3595).

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

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

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

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

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

It can be readily measured, however, with an electrometer by using the technique described in Section VI-B.

Therefore, a voltmeter with high input resistance, such as an electrometer, is required.

Electrometer ammeters and picoammeters and methods of making low current measurements were described in Sections 1 and 2 respectively.

Figure 2-42 illustrates a clipped waveform taken from the 2V analog output of an electrometer.

Figure 2-33 shows the electrometer ohmmeter measuring a resistance (R).

See Section 2. 6. 6 for details on appropriate cabling and connector types for electrometer measurements.

The Model 7001 Switch System switches the electrometer and voltage source to each test pattern, X1 through X10.

An electrometer, such as the Model 6517A, is required to make this measurement.

In these instances, an electrometer voltmeter with a current source can be used to make this measurement;

Bases for gm counter tubes - Interrelationship of quartz-fiber electrometer type exposure meters and companion exposure meter chargers

Interrelationship of quarz-fiber electrometer type exposure meters and companion exposure meter chargers

Teaching design and practice for synthesis and designing experiment of electrometer's change

The Error Reason of Electrometer in the Calibration Period to Analyze and Countermeasure

Factory calibration of the electrometer

The electrometer voltmeter has minimal effect on the circuit being measured

The Design of Three -phase Pay in Advance Electrometer

Use of Voltmeter and Electrometer in Electrocircuits