HP 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
Plug-in cards
The HP 3457A supports one plug-in card in the rear, which replaces the rear terminals. Two cards are supported by the device.
Rear terminals
The rear terminals provide the same five-terminal measurement capability as the front panel terminals. The rear terminal block can be replaced by one of the following relay multiplexer cards.
44491A Armature Relay Multiplexer
This card supports 10 input channels. The last two channels are dedicated to current measurements while the other wight can be configured for either two-terminal measurements, or four-wire resistance measurements.
- 8 - voltage, 2-wire resistance channels
- 4 - four-wire resistance channels
- 2 - current channels
44492A Reed Relay Multiplexer
This card supports 10 channels, multiplexable to the voltage inputs. It supports voltage, two-wire resistance and frequency measurements.
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.