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The HP3457A is a very high precision multimeter which measures:
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Voltage DC, AC and DC+AC volts
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Currents in AC, DC or DC+AC
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Resistance two and four wire connection
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Frequency
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Period
The instrument can do slower high resolution measurements to 6 1/2 digits and up to 7 1/2 in math mode, or up to 1000 readings/seconds with the lowest digit resolution mode. The instrument has a HP-Interface bus. Mathematical functions. On the backside there can be installed a plug-in-option 44491A Armature Relay Mulitplexer Assembly or 44492A Reed Relay Multiplexer Assembly.
In all cases of my experience, I checked these types of instruments with high quality standards in a certified calibration labority, the instruments were always better than the given specification, even after long periods of recalibration! My compliments to the manufactorer.
SIMPLIFIED SPECIFICATION (not complete, the original specification is much more detailed, taken from a year 1988 service manual)
DC VOLTAGE INPUT CHARACTERISTICS:
6 full scale ranges from 30mV (max.10nV resolution) to 300V (max. 100µV resolution)
Input Resistance for 30mV to 3V range 10 gigaohms
Input Resistance for 30V to 300V range 10 megohms
Maximum Input Voltage: HI or LO to Earth Ground +/-450V peak
Measurement Accuracy: +/-(% of reading + Number of Counts) with Auto Zero ON
DC VOLTAGE ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard 24 hour specifications apply if the instrument is calibrated between 90% and 100% of full scale. For calibration between 33% and 90% of full-scale, add 0.00015% to %Reading :
|
24 HOUR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 30mV |
0.0012 |
215 |
350 |
6 |
| 300mV |
0.0005 |
24 |
35 |
4 |
| 3V |
0.00035 |
5 |
6 |
4 |
| 30V |
0.00065 |
9 |
20 |
4 |
| 300V |
0.0025 |
5 |
6 |
4 |
DC VOLTAGE ACCURACY 90 DAYS Tcal +/-5°C After 1h warm up
|
90 DAYS |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 30mV |
0.0040 |
365 |
500 |
6 |
| 300mV |
0.0025 |
39 |
50 |
4 |
| 3V |
0.0017 |
6 |
7 |
4 |
| 30V |
0.0035 |
19 |
30 |
4 |
| 300V |
0.0050 |
6 |
7 |
4 |
DC VOLTAGE ACCURACY 1 YEAR Tcal +/-5°C After 1h warm up
|
1 YEAR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 30mV |
0.0045 |
365 |
500 |
6 |
| 300mV |
0.0035 |
39 |
50 |
4 |
| 3V |
0.0025 |
6 |
7 |
4 |
| 30V |
0.0040 |
19 |
30 |
4 |
| 300V |
0.0055 |
6 |
7 |
4 |
PLC = Integration in Power Line Cycles. When using integration times of 100 PLC, 10 PLC, or 1 PLC; multiply Number of Counts in the table by 0.1 for 5 1/2 digit readings, 0.01 for 4 1/2 digit readings and 0.001 for 3 1/2 digit readings. Tcal = Temperature ambient during calibration (should 18-28°C).
TEMPERATURE COEFFICIENT: +/-(% of Reading + Number of Counts)/°C 6 1/2 digits displayed, Auto zero OFF are given for a stable environment (+/-1°C) and over a ten minute period. Multiply number of counts by 0.1 for 5 1/2 digits, 0.01 for 4 1/2 digits and 0.001 for 3 1/2 digits.
| Range |
Auto Zero ON |
Auto Zero OFF |
| 30mV |
0.0005 + 30 |
0.0005 + 40 |
| 300mV |
0.0005 + 3 |
0.0005 + 13 |
| 3V |
0.0005 + 0.3 |
0.0005 + 10.3 |
| 30V |
0.0005 + 1 |
0.0005 + 11.0 |
| 300V |
0.0005 + 0.3 |
0.0005 + 10.3 |
MAXIMUM READING RATES: (Readings/Second)
| Integration Time |
Digits Displayed |
Reading Rate |
| 60 Hz |
50 Hz |
| 0.0005 PLC |
3 1/2 |
1350 |
1350 |
| 0.005 PLC |
4 1/2 |
1250 |
1250 |
| 0.1 PLC |
5 1/2 |
360 |
312 |
| 1 PLC |
6 1/2 |
53 |
45 |
| 10 PLC |
6 1/2 |
4.8 |
4.0 |
| 100 PLC |
6 1/2 |
0.48 |
0.40 |
DC CURRENT INPUT CHARACTERISTICS:
6 full scale ranges from 300µA (max. 100pA) to 1A (max.1µA)
Shunt resistance from 1000 Ohm to 0.1 Ohm
DC CURRENT ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard
|
24 HOUR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 300µA |
0.0020 |
54 |
65 |
4 |
| 3mA |
0.002 |
54 |
65 |
4 |
| 30mA |
0.0020 |
54 |
65 |
4 |
| 300mA |
0.03 |
154 |
165 |
4 |
| 1A |
0.03 |
504 |
515 |
5 |
DC CURRENT ACCURACY 1 YEAR Tcal +/-5°C 1h warm up Accuracy relative to calibrated standard
|
1 YEAR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 300µA |
0.04 |
104 |
115 |
4 |
| 3mA |
0.04 |
104 |
115 |
4 |
| 30mA |
0.04 |
104 |
115 |
4 |
| 300mA |
0.08 |
204 |
215 |
4 |
| 1A |
0.08 |
604 |
615 |
5 |
RESISTANCE (4-WIRE OHMS, 2-WIRE OHMS, OFFSET COMPENSATED OHMS)
Input Characteristics:
Input Protection: HI sense to LO sense +/-350V peak
HI or LO to Earth ground +/-450V peak
Max. open circiut voltage 30 Ohm to 3M ranges: 12V. 30M to 3G ranges: 8.5V
| Range (Ohms) |
Maximum Reading 6 1/2 |
Resolution |
Current through Unknown |
| 30 |
30.3 |
10µ |
1mA |
| 300 |
303 |
1m |
1mA |
| 3k |
3.03k |
10m |
1mA |
| 30k |
30.3k |
100m |
100µA |
| 300k |
303k |
1 |
10µA |
| 3M |
3.03M |
10 |
1µA |
| 30M |
30.3M |
100 |
100nA |
| 300M |
303M |
1k |
100nA |
| 3G |
3.03G |
10k |
100nA |
RESISTANCE 4-WIRE ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard
|
24 HOUR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 30 |
0.003 |
215 |
350 |
6 |
| 300 |
0.0015 |
24 |
35 |
4 |
| 3k |
0.001 |
5 |
6 |
4 |
| 30k |
0.001 |
5 |
6 |
4 |
| 300k |
0.001 |
6 |
8 |
4 |
| 3M |
0.003 |
12 |
16 |
5 |
| 30M |
0.02 |
80 |
93 |
4 |
RESISTANCE 4-WIRE ACCURACY 1 YEAR Tcal +/-5°C 1h warm up Accuracy relative to calibrated standard
|
1 YEAR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
6 1/2 digits 1 PLC |
3 1/2 digits 0.0005 PLC |
| 30 |
0.0075 |
315 |
450 |
6 |
| 300 |
0.0055 |
34 |
45 |
4 |
| 3k |
0.005 |
6 |
7 |
4 |
| 30k |
0.005 |
6 |
7 |
4 |
| 300k |
0.005 |
7 |
9 |
4 |
| 3M |
0.0065 |
12 |
16 |
5 |
| 30M |
0.04 |
80 |
93 |
5 |
RESISTANCE 2-WIRE ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard
|
24 HOUR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
| 30 |
0.003 |
20215 |
| 300 |
0.0015 |
2024 |
| 3k |
0.001 |
205 |
| 30k |
0.001 |
25 |
| 300k |
0.001 |
8 |
| 3M |
0.003 |
12 |
| 30M |
0.02 |
80 |
| 300M |
0.6 |
1000 |
| 3G |
6.0 |
1000 |
RESISTANCE 2-WIRE ACCURACY 1 YEAR Tcal +/-5°C 1h warm up Accuracy relative to calibrated standard
|
1 YEAR |
Number of Counts |
| Range |
%Reading |
6 1/2 digits 100 PLC |
| 30 |
0.0075 |
20315 |
| 300 |
0.0055 |
2034 |
| 3k |
0.005 |
206 |
| 30k |
0.005 |
26 |
| 300k |
0.005 |
9 |
| 3M |
0.0065 |
12 |
| 30M |
0.04 |
80 |
| 300M |
1.6 |
1000 |
| 3G |
16 |
1000 |
TRUE RMS AC coupled VOLTAGE ACCURACY INPUT CHARACTERISTICS
Input Impedance: 1Megohm +/-1% shunted by <90pF (<115pF rear input)
Maximum Input Voltage: +/-450Vpeak
HI or LO to Earth Ground: +/-450Vpeak
CREST FACTOR: 3.5 to 1 at full scale
| Range |
Maximum Reading |
6 1/2 digits Resolution |
| 30mV |
32.50000mV |
10nV |
| 300mV |
325.0000mV |
100nV |
| 3V |
3.250000V |
1µV |
| 30V |
32.50000V |
10µV |
| 300V |
325.0000V |
100µV |
TRUE RMS AC coupled VOLTAGE ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard
|
24 HOUR 30mV to 30V ranges |
Number of Counts |
| Frequency |
%Reading |
6 1/2 digits >=1 PLC |
| 20Hz-45Hz |
0.5 |
720 |
| 45Hz-100Hz |
0.15 |
720 |
| 100Hz-20kHz |
0.07 |
720 |
| 400Hz-20kHz |
0.08 |
720 |
| 20kHz-100kHz |
0.6 |
1700 |
| 100kHz-300kHz |
3.1 |
9300 |
| 300kHz-1MHz |
10.1 |
66000 |
TRUE RMS AC coupled VOLTAGE ACCURACY 90 DAYS Tcal +/-5°C 1h warm up Accuracy relative to calibrated standard
|
90 DAYS 30mV to 30V ranges |
Number of Counts |
| Frequency |
%Reading |
6 1/2 digits >=1 PLC |
| 20Hz-45Hz |
0.56 |
1120 |
| 45Hz-100Hz |
0.21 |
1120 |
| 100Hz-20kHz |
0.13 |
1120 |
| 400Hz-20kHz |
0.14 |
1120 |
| 20kHz-100kHz |
0.66 |
2100 |
| 100kHz-300kHz |
3.16 |
9700 |
| 300kHz-1MHz |
10.16 |
66400 |
300V range is similar to the 30mV to 30V ranges, a little more bad.
TRUE RMS AC coupled CURRENT ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard
|
24 HOUR 30mA and 300mA ranges |
Number of Counts |
| Frequency |
%Reading |
6 1/2 digits >=1 PLC |
| 20Hz-45Hz |
0.8 |
2800 |
| 46Hz-100Hz |
0.25 |
2800 |
| 101Hz-20kHz |
0.2 |
2800 |
| 400Hz-20kHz |
0.2 |
2800 |
| 21kHz-100kHz |
0.9 |
4000 |
TRUE RMS AC coupled CURRENT ACCURACY 24 HOUR Tcal +/-1°C 2h warm up Accuracy relative to calibrated standard
|
24 HOUR 1A range |
Number of Counts |
| Frequency |
%Reading |
6 1/2 digits >=1 PLC |
| 20Hz-45Hz |
0.9 |
2800 |
| 46Hz-100Hz |
0.35 |
2800 |
| 101Hz-20kHz |
0.30 |
2800 |
| 400Hz-20kHz |
0.30 |
2800 |
FREQUENCY and PERIOD ACCURACY
| Frequency |
Period |
%Reading |
| 10Hz-400Hz |
100ms - 2.5ms |
0.05 |
| 400Hz-1.5MHz |
2.5ms to 667ns |
0.01 |
|
