HP 82479A Owner's Manual page 61

Front Panel Program
5.2 FRONT PANEL FUNCTIONS
The functions of the individual front panel command keys are as follows:
Voltage: [ACV] [DCV]
Measures AC Volts and DC Volts, respectively. The measurements are made with Autorange on and
Autozero on.
Current: [CUR]
Measures DC current in the 4-20mA range (assuming a S0Q shunt resistor).
Resistance: [2WO] [4WO]
Measures resistance using the two-wire ohm or four-wire ohm test method, respectively.
Frequency: [FRQ]
Measures frequency using the current gate time (refer to the IZHTE keyword in section 3). The default
gate time 1s one second.
Close Channel: [CLS]
Used to close a relay channel or set an output bit on a digital card. Press [CLS] and enter the number of
the channel to close. Any closed multiplexer channels will be opened first, and the requested channel will
be closed.
Close Channel Pair: [CLP]
Used to close a channel pair for four-wire ohm measurements. Press [CLP] and enter the lowest channel
number of the desired pair. For instance, to close the channel pair of 4 and 14, enter 4. Any previously
closed multiplexer channels will be opened.
Open Channel: [OPN]
Used to open a relay channel or clear an output bit on a digital card. Press [OPN] and enter the number
of the channel to open. If a channel pair has been closed, the paired channel will also be opened.
Digits Of Resolution: [DIGITS]
Sets the number of digits of resolution in the HP 3421A. Press [DIGITS] and press 3, 4, or § to set the
resolution.
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