DIGITAL MULTIMETERS
3 1/2 to 61/2 Digit DMM with Extended Resolution to 71/2 Digits
HP Model 3457A
Over 1350 Readings/sec at 3 1/2 Digits
Seven Functions—DCV, ACV, DCI, ACI, Ohms,
Frequency and Period
Three Plug-in Multiplexer Options
DC Sensitivity to 10 Nanovolts
Outstanding Combination of Performance and Price
Description
The HP 3457A has seven functions with 3'/2 to 6'/2 digits of resolution extendable to 7'/z digits at reading rates from 1 reading every 2
seconds to 1350 rds/s and basic DC volts accuracy as good as 5 ppm.
In addition, the input of the HP 3457A can be expanded up to ten
channels with either of the optional plug-in multiplexer assemblies.
On the bench, the front panel operation is extremely flexible and comprehensive. In systems, the Hewlett-Packard Interface Bus (HP-IB)
is standard.
Powerful Measurement Management
The HP 3457A combines superb analog measuring capability with
equally powerful measurement management. More than 1000 readings or whole measurement sequences can be stored in the HP 3457A
for convenient and fast measurement throughput. The present dmm
setup can be stored in the non-volatile state memory for convenient
reconfiguration of the dmm.
Additional power from math functions can be obtained by using
PASS/FAIL limit testing, NULL, SCALE, THERMISTOR
linearization, and others. The power of total electronic calibration,
including AC volts, makes it easy to maintain instrument perform-
ance.
System Features
Keeping with HP's long tradition of systems oriented digital mul-
timeters, the HP 3457A has all the systems features you've come to
expect plus more to make interfacing to your computer even easier—features like flexible formatting of ASCII, 16 bit binary, or 32 bit
binary data and buffer memory so that you can take measurements
with the HP 3457A at its highest speed. In addition, you'll find the
VOLTMETER COMPLETE output and EXTERNAL TRIGGER
input signals ideal for synchronizing other instrumentation with the
HP 3457A. Finally, programmable front-rear terminal switching lets
you measure two separate inputs without a scanner.
Hewlett-Packard Multimeter Language (HPML)
Another first for the HP 3457A DMM is an easy-to-use dmm language—HPML. Designed so that software written for today's multimeter will fit tomorrow's, HPML only asks you to define the
parameters necessary to accomplish your measurement. For example,
if you want to make a measurement on a 9 volt DC signal with 0.01%
resolution, the command sequence is "DCV,9,.01".
Control Interface Intermediate Language (CIIL)
With Option 700, the HP 3457A responds to standardized DMM
CIIL commands via HP-IB. Physically and functionally identical to
the standard HP 3457A, Option 700 adds the CIIL command set
with a built-in Test Module Adapter (TMA) to the DMM's standard
HPML. The HP 3457A is further enhanced by adding the functions
of AC and DC current measurement through CIIL through HP-IB.
Three Rear Panel Plug-In Options
Either one of three different optional assemblies may be used with
the HP 3457A for different measurement capabilities. Using the multiplexer assemblies will enable up to ten signal channels to be scanned
either sequentially or randomly. All of the functional capability offered through the normal front and rear input terminals is available
for multiple inputs. Using the high voltage assembly allows single
channel measurement of either AC or DC voltages at the rear panel.
For measurement flexibility, the HP 44491A Armature Relay
Multiplexer Assembly offers eight two-wire channels and two current/actuator channels. Under software control, the eight two-wire
channels can be reconfigured to four 4-wire ohm channels. The two
current channels offer automatic make-before-break switching so
that the path for current as high as 1.5 A is never broken. In addition,
these two channels can be used as external device actuator channels.
Each channel can switch up to 150 V. The general purpose multiplexer can close a channel and make a measurement at a maximum rate of
33 channels per second.
For higher speed scanning, the HP 44492A Reed Relay Multiplex-
er Assembly offers ten two-wire channels. The HP 44492A is useful
for switching dcV, acV, ac+dcV, two wire ohms, frequency and period measurement signals with a maximum amplitude of 125 V. The
Reed Relay Multiplexer can close a relay and make a measurement at
a maximum rate of 300 channels per second.
For measurement of voltages up to 1414V peak, the HP 44497A
High Voltage Assembly offers a 1000:1 attenuator input (channel 1)
for the high voltage measurements. In addition, the other rear terminal input (channel 0) can be utilized to perform conventional VDC,
VAC, Two-wire and Four-wire Ohms, Period, Frequency, DCI, and
ACI measurements. Using the HP 44497A with HP 3457A in the 6 1/2
digit mode will yield a resolution of 1 mV for a 1000 V input. Implementing the MATH Scale function will have the HP 3457A LCD
display the measurement results in the correct units of kilovolts.
DIGITAL MULTIMETERS
31/2 to 61/2 Digit DMM with Extended Resolution to 71/2 Digits (cont'd)
HP Model 3457A
Abbreviated Technical Specifications
90 day, Tcal ± 5 deg. C
DC Voltage
1. After 1 hr warm-up, integration time 100 PLC. Tcal is the temper-
ature of the calibration environment between 18 and 28 deg C.
DC Current
1. After 1 hr warm-up, integration time 100 PLC. Tcal is the temper-
ature of the calibration environment between 18 and 28 deg C.
Resistance
(2 and 4
wire
ohms)
2
True RMS ACV and (AC+DC)V
Bandwidth: 20 Hz to 1 MHz
Crest Factor: 3.5 to 1 at full scale
Common Mode Rejection: (1 kOhm unbalance in LO): > 76 dB, I C
to 60 Hz
Accuracy: (90 day)
Accuracy specified for sine wave inputs, >10% of range. DC com-
ponent <10% of AC component after 1 hr warm-up and within one
week of autocal. Integration time = 10 PLC. AC Band set to <400
Hz. DC coupled mode requires 2 hour warm-up.
True RMS ACI and (AC+DC)I
Bandwidth: 20 Hz to 100 kHz Crest Factor: 3.5 to full scale
Accuracy: (90 day)
Accuracy specified for sine wave inputs, >10% of range. DC com-
ponent <10% of AC component after 1 hr warm-up and within one
week of autocal. Integration time = 10 PLC. AC Band set to <400
Hz. DC coupled mode requires 2 hour warm-up.
1. After 1 hr warm up, integration time 100 PLC. Tcal is the temper-
ature of the calibration environment between 18 and 28 deg C.
2. For two-wire ohms, add 200m Ohms to count error specifications.
3. For two-wire ohms only, Accuracy is specified following autocal
(ACAL), under stable conditions (±1 deg C).
Maximum Reading Rates (DCV, DCI, and Resistance up to 30
2
kOhm)
1. Using Math HIRES mode.
2. Reading rates are specified with zero delay, fixed range, display
off, and front panel off. The output is to internal reading memory
using single integer format and internal timer.
3. Integration Time in Power Line Cycles (PLC).
Common Mode Rejection (dB): (1 kOhm unbalance in low lead)
DC ECMR 140 dB; AC ECMR: <1 PLC, 76 dB; AC ECMR >1
PLC 156 dB, for 50, 60 Hz ±.C
1. Reading rates are specified with preprogrammed delays, fixed
range, and Auto Zero on.
Frequency and Period: Measures the frequency or period of the
ac component of the ac or dc coupled voltage or current input. The
counter uses a reciprocal counting technique to give constant resolu-
tion independent of input frequency.
Input Impedance: Refer to AC voltage and current specifications.
Frequency Range: 10 Hz to 1.5 MHz (voltage input)
10 Hz to 100 KHz (current input)
Period Range: .1 s to 667 ns (voltage input)
.1 s to 3.33 us (current input)
Sensitivity: 10 mV or 100 MA (sinewave)
Triggering: Triggers and counts on zero crossings
Accuracy: (1 vear)
Maximum Reading Rate: 2.0 rdgs/s for integration time of 1 PLC,
AC Band >400 Hz, delay zero and math off, and fixed range.
Memory: 2139 available bytes that can be partitioned into 3 seg-
ments, one devoted to storing measurements, one devoted to storing
measurement subprograms, and one devoted to storing instrument
states.
Loading...