HP 3457A

Hewlett-Packard 3457A

Status	supported
Source code	hp-3457a
Counts	30300000
IEC 61010-1	450V p-p max
Connectivity	GPIB
Measurements	voltage, current, resistance, frequency, period
Features	autorange, readings memory, four-wire resistance
Website	keysight.com

The Hewlett-Packard 3457A is a 7.5 digits (30300000 counts) bench digital multimeter with GPIB connectivity.

Hardware

• Precision Subsurface Zener Voltage reference: Linear Technology LM399
• Analog board microprocessor: Intel 8051
• Digital board microprocessor: Motorola 6800

sigrok quirks

The HP3457A can only be accessed via GPIB. On linux, it will most likely be accessed with libgpib. The conn parameter will then be of the form "libgpib/<device_name>", where device_name is the name entry be specified in a gpib.conf device section.

The device supports a configurable ADC integration time based on the number of powerline cycles. This can be specified by using the nplc key. Since there is no way to query the measurement quantity, it should be specified before starting an acquisition, else the unit will not be reported. This is done via the measured_quantity key.

For example, to read two voltage samples from libgpib device hp3457a, with 10 powerline cycles integration time:

sigrok-cli --driver=hp-3457a:conn=libgpib/hp3457a \
  --samples 2 \
  --config "measured_quantity=voltage:nplc=10"

Photos

TODO (need to get a decent camera).

Also see EEVBlog's teardown pictures.

Resources

• EEVBlog teardown of the 3457A