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Model 2750 Multimeter/Switch System Service Manual Performance Verification 1-17

2750 Verification

Figure 1-7

Connections for Model 2750 dry circuit resistance verification

2. Set the calibrator for 4-wire resistance with external sense on.

3. Select the Model 2750 4-wire resistance function by pressing the 4 key, then

choose the SLOW integration rate with the RATE key.

4. Select the Model 2750 dry circuit resistance function by pressing SHIFT then

DRYCKT.

5. Set the Model 2750 for the 1 range, and make sure the FILTER is on. Enable

OCOMP (offset-compensated ohms) by pressing SHIFT then OCOMP. (Use

OCOMP for 1, 10, 100, and 1k range verification.) Enable line sync ON by

pressing SHIFT then LSYNC.

NOTE Maximum reading rate for the 1k¾ range is two readings per second.

6. Recalculate reading limits based on actual calibrator resistance values.

7. Source the nominal full-scale resistance values for the 1-1k ranges summarized

in Table 1-7, and verify that the readings are within calculated limits.

Input

Output

Resistance Calibrator

Note: Use low-thermal cables to minimize noise.

Sense

3A, 250V

500V

PEAK

FRONT/REAR

AMPS

INPUT

SENSE

Ω 4 WIRE

INPUT

350V

PEAK

1000V

PEAK

CAT I

Model 2750

Front Panel

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A

Keithley 2750 Service Manual

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