Model DMM7512 7½ Digit Sampling Multimeter Instrument Information
071357601 / October 2018
11
Verification and adjustment
The DMM7512 contains two independent DMM modules that each support a sub-set of DMM7510 functions
and specifications. For supported functions, the commands are identical to DMM7510.
To verify and adjust the DMM7512, use the procedures in the
Model DMM7510 7½ Digit Graphical Sampling
Multimeter Calibration and Adjustment Manual
(Keithley document number DMM7510-905-01), with the
following exceptions:
▪
The DMM7512 contains two independent DMM modules. Each module requires separate calibration and
adjustment.
▪
The DMM7512 does not support AC voltage or AC current functions, and it does not support the 10 A
current range. Therefore, only DC verification and adjustment steps are required.
▪
Each DMM7512 module has only one block of inputs, which is on the rear panel. The DMM7512 inputs are
equivalent to the front-panel inputs of the DMM7510. Therefore, only use
cal.adjust.dc()
commands
when making calibration adjustments. The
cal.adjust.rear.dc()
commands are not used for the
DMM7512.
▪
The DMM7512 does not include a GPIB interface or front-panel display. You must perform calibration and
adjustment using USB or LAN connection methods. You can use the methods described in "Adjustment
command timing and error checking" in the
Calibration and Adjustment Manual
.
▪
Due to the heavier metal chassis thermal mass, the DMM7512 requires more warm-up time than the
DMM7510. Allow 4 hours warm up before performance verification or calibration adjustment.
▪
Refer to the DMM7512 specifications (document number SPEC-DMM7512) when calculating performance
verification limits as described in "Calibration Verification Limits" in the
Calibration and Adjustment Manual
▪
Where front panel procedures (such as autocalibration) are referred to, you can use the virtual front panel
if you have a LAN connection. Refer to
Accessing the virtual front panel
(on page 9).
Other differences between the DMM7510 and DMM7512 procedures:
▪
In the "Recommended test equipment" list in the
Calibration and Adjustment Manual
, the Keithley
Instruments 3390 and IET Labs, Inc., 1423-A and HACS-Z-A-2E 1uF instruments are not required.
▪
In the "Test Summary" list, omit the following verification procedures:
▪
AC voltage verification
▪
Frequency verification
▪
AC current verification
▪
Capacitance verification
▪
All rear-panel (10 A) tests
▪
In the "Adjustment" section, perform only calibration steps DC step 0 through DC step 5 as described in
"Front-terminal adjustment steps." Omit all other adjustment steps.
Software and drivers
