Keithley 2750 Service Manual

Model 2750 Multimeter/Switch System Service Manual Performance Verification 1-29
7700 Verification
2. Install the Model 7700 in Slot 1 of the Model 2750, then turn on the power, and
allow the unit to warm up for two hours before proceeding. Be sure the front panel
INPUTS switch is set to the REAR position.
3. Set the calibrator for 4-wire resistance with external sense on.
4. Select the Model 2750 4-wire resistance function by pressing the 4 key. Close
Channel 1 by pressing the CLOSE key, then ENTER for “SINGLE” channel, and
keying in 101.
5. Set the Model 2750 for the dry circuit resistance function by pressing SHIFT then
DRYCKT.
Figure 1-15
Connections for Model 7700 dry circuit resistance verification
HLHL
AMPS
HLHLHLHLHLHL
LO
CH21 CH22 CH11 CH12 CH13 CH14 CH15 CH16
HLHLHLHL
CH17 CH18 CH19 CH20
SENSE
(OHMS, 4 WIRE)
INPUT
(V, 2 WIRE)
HLHLHLHL
CH7 CH8 CH9 CH10
HLHL
HLHL
HLHL
HLHL
INPUT SENSE
CH1 CH2
CH3
CH4
CH5
CH6
CH1
CH11
Output
HI
Output
LO
Resistance Calibrator
Note: Use shielded, low-thermal cables
to minimize noise.
Model 7700
Sense HI
Sense LO

Keithley 2750 Specifications

General

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