Keithley 2750, Service Manual

Page: 70 / 179

2-22 Calibration Model 2750 Multimeter/Switch System Service Manual
Figure 2-5
Function generator connections for manufacturing calibration
8. After the last AC current calibration step, the instrument will prompt you to enter
3Hz at 1V RMS and 1kHz with the following prompts:
• Low-frequency cal: Set the function generator to output a 1V RMS, 3Hz sine
wave. Use the left and right arrow keys, and the range keys to adjust the dis-
play to agree with the generator amplitude you measured previously, then
press ENTER.
• Frequency cal: Set the function generator to output a 1V RMS, 1kHz sine
wave. Enter 1.000000kHz at the prompt, then press ENTER.
9. Set the calibration dates, then save calibration to complete the process.
Remote manufacturing calibration
1. Install the shorted calibration extender board (see “ Extender board preparation ”
earlier in this section) in scanner card Slot 1, and select the rear inputs with the
INPUTS switch. Allow three minutes for thermal equilibrium.
2. Press in and hold the OPEN key while turning on the power.
3. Enable calibration by sending the :CODE command. For example, the default com-
mand is:
:CAL:PROT:CODE 'KI002750'
4. Initiate calibration by sending the following command:
:CAL:PROT:INIT
5. Calibrate step 0 with the following command:
:CAL:PROT:DC:STEP0
BNC-to-Dual
Banana Plug
Adapter
Function
Output
Function Generator
50
Ω
Coax
Cable
3A, 250V
Model 2750
Front Panel
Note: Output voltage must be accurately
measured. (See text.)
!
F
500V
PEAK
FRONT/REAR
AMPS
HI
INPUT
LO
SENSE
Ω
4 WIRE
INPUT
350V
PEAK
1000V
PEAK
R
CAT I