
Section 3: Calibration
Model DMM7510 7½ Digit Graphical Sampling Multimeter Calibration Manual
3-2
DMM7510-905-01 Rev. A / April 2015
Line power
The Model DMM7510 requires a line voltage of 100 V to 240 V and a line frequency of 50 Hz or
60 Hz.
The instrument must be calibrated within this range.
The instrument automatically senses the line frequency at power-up.
Warmup period
Allow the Model DMM7510 to warm up for at least 90 minutes before conducting the calibration
procedures.
If the instrument has been subjected to temperature extremes (those outside the ranges stated
above), allow additional time for the internal temperature of the instrument to stabilize. Typically, allow
one extra hour to stabilize a unit that is 10 °C (18 °F) outside the specified temperature range.
Also, allow the test equipment to warm up for the minimum time specified by the manufacturer.
Calibration considerations
When performing calibration procedures:
•
Make sure that the equipment is properly warmed up.
•
Make sure that the test equipment is connected to the Model DMM7510 rear-panel or front-panel
input and output terminals as shown in the connection diagrams. Also be certain that the correct
terminals are selected with the TERMINALS FRONT/REAR switch.
•
Always let the source signal settle before calibrating each point.
•
Make sure the calibrator is in OPERATE mode before you complete each calibration step.
•
If an error occurs during calibration, the Model DMM7510 generates an appropriate event log
message.
•
Be sure to set adjustment and calibration dates and save calibration after adjustment.
The front and rear terminals of the instrument are rated for connection to circuits rated
Measurement Category II up to 300 V, as described in International Electrotechnical
Commission (IEC) Standard IEC 60664. This range must not be exceeded. Do not connect
the instrument terminals to CAT III or CAT IV circuits. Connection of the instrument
terminals to circuits higher than CAT II can cause damage to the equipment and severe
personal injury.
The maximum input voltage between INPUT HI and INPUT LO is 1000 V
peak
. Exceeding this
value may create a shock hazard.
The maximum common-mode voltage (the voltage between INPUT LO and chassis ground) is
500 V
peak
. Exceeding this value may cause a breakdown in insulation that can create a shock
hazard.