3706 Multimeter / Switch System
Rev A 9/14/07
DC Notes
End dc
DC Notes
1. 20 % overrange except 1% on 300V and 3.33% on 3A.
2. ±5% (Measured with 10M: input Resistance DMM, >10G: DMM on 10M: and 100M: ranges). Refer to table
for other 2W/4W configurations. For Dry Circuit, +20%, <1mV with dmm.offsetcompensation=ON for 100:
2k: ranges.
Ocomp Ocomp
Range 2W 4W
4W-
Kelvin 4W
4W -
Kelvin
1, 10:
8.2V 8.2V 8.2V 12.1V 12.1V
100, 1k:
13.9V 14.1V 13.9V 15.0V 12.7V
10k:
9.1V 9.1V 9.1V 0.0V 0.0V
100k, 1M:
12.7V 14.7V 12.7V
10M, 100M:
6.4V 6.4V 6.4V
3. Relative to calibration accuracy.
4. Add the following additional uncertainty:
Card
DCV
“of range”
100k
“of reading + of range”
1M
“of reading”
3720, 3721 , 3730
4.5PV
8ppm + 7pm 8ppm
3722
4.5PV
8ppm + 7ppm 8ppm
3723
6PV
8ppm + 7ppm 8ppm
5. Specifications are for 4-wire :, 1:o 100: with offset compensation on. Model 3700 plug-in cards with LSYNC
and offset compensation on. 2-wire : specifications are for dmm.connect=dmm.CONNECT_ALL.
For 2-wire :, add the following to “ppm of range” uncertainty,
700m: with dmm.connect=dmm.CONNECT_TWO_WIRE, 100m: with REL, and 1.5: without REL.
1: range is 4-wire only.
6. Test current with dmm.offsetcompensation=OFF, (r 5%).
7. Add the following to “ppm of reading” uncertainty when using 3700 plug in cards in Operating Environment
50%RH.
Card
10k
100k
1M
10M
100M
3720, 3721, 3730
with MTC D-Shell connector
1ppm 10 ppm 0.01% 0.1% 1%
3722, 3723 and
3720, 3721, 3730 with
–ST screw terminal module
10ppm 100 ppm 0.1% 1% 10%
3700 plug in cards Operating Environment: Specified for 0qC to 50qC, 70%RH at 35qC.
8. For 4-wire : only, offset compensation and LSYNC on. For Models 3722 and 3723, 10: o2k: ranges only.
9. Includes Analog Backplane 15-pin rear panel connector. For 3721, refer to DC Current table for additional
uncertainties.
10. For L
SYNC
On, line frequency +/-0.1 %.
nPLC 5 1 0.2 <0.2
L
SYNC
On NMRR 110 dB 90dB 70dB
L
SYNC
Off NMRR 60dB, ±2dB 60dB, ±2dB
11. For 1kohm unbalance in LO lead. AC CMRR is 70dB.
nPLC 5 1
0.2
12
0.2
CMRR 140 dB 140dB 120dB 80dB
12. For L
SYNC
On.
13. Reading rates are for 60Hz (50Hz) operation using factory defaults operating conditions dmm.reset("all"),
Autorange off, Limits off, dmm.autodelay=dmm.ON, dmm.opendetector=dmm.OFF, format.data.=format.SREAL,
DCV=10V, 2W/4W=1K:, DCI=1mA, Dry-Ckt=10:, ACI=1mA, and ACV=1V. For Dry-Ckt 100: and 2K:,
60rdg/s max with offset compensation OFF and 29.5rdg/s max with offset compensation ON. For Temperature
reading rates use DCV for T/C, 2W: for Thermistor, and 4W: for RTD. Speeds include measurements and binary
data transfer out the Enet, GPIB or USB.
14. DMM configured for single reading, dmm.measurecount=1 and print(dmm.measure()).
15. DMM configured for multi-sample readings and single buffer transfer, dmm.measurecount=1000,
buf=dmm.makebuffer(1000), dmm.measure(buf), and printbuffer(1, 1000, buf).
16. dmm.autozero=dmm.ON. RMS Noise using low thermal short for DCV, 2W:, 4W:, and Dry-Ckt :. For DCI,
dmm.connect=dmm.CONNECT_NONE or 0. Includes Model 3721 card accuracies.
17. For DC, dmm.nplc=0.0005. For AC, dmm.detectorbandwidth=300, dmm.nplc=0.0005. For ACI,
dmm.autodelay=dmm.ON (50ms), max rate is 50ms and ACV dmm.autodelay=dmm.ON (50ms), max rate is 50ms.
18. Speeds are within same Mux bank. Add an additional 8msec when changing banks or slots.
19. When properly zeroed using REL function.
DC Measurement Characteristics
DC Volts:
A-D LINEARITY: 1.0 ppm of reading + 2.0 of range.
INPUT IMPEDANCE:
100mV – 10V Ranges:
Selectable >10G:// <400pF or 10M: r1%.
100V – 300Vranges: 10M: r1%.
Input Bias Current:
<50pA at 23qC with dmm.autozero=dmm.OFF or
dmm.inputdivider=dmm.ON.
Common Mode Current:
<500nA peak-to-peak for 1MHz.
Autozero OFF Error: For DCV r1qC and <10minutes,
Add r(8ppm of reading + 5PV).
Input Protection: 300V all ranges.
Common Mode Voltage: 300V DC or 300Vrms (425V peak for AC waveforms)
between any terminal and chassis.
Resistance:
MAX 4W
LEAD RESISTANCE: 5: per lead for 1: range, 10% of range
for 10: o 1k: ranges; 1k: per lead for all other ranges.
For Dry Ckt
.
MAX 4W
LEAD RESISTANCE: 0.5: per lead for 1: range; 10% of range
per lead for 10: o 100: ranges; 50: per lead for 1k: o 2k: range.
INPUT IMPEDANCE:
1
– 100
Ranges: 99k: r1% // <1PF.
1K
– 2K
Ranges: 10M: r1% // <0.015PF.
OFFSET COMPENSATION: Selectable on 4W: 1: o10k: ranges.
OPEN LEAD DETECTOR: Selectable per channel. 1.5uA, r20% sink
current per DMM SHI and SLO lead. Default on.
CONTINUITY THRESOLD: Adjustable 1 to 1000:.
Autozero OFF Error: For 2W: r1qC and <10minutes,
Add r(8ppm of reading + 0.5m: for 10: and 5m: for all other ranges).
INPUT PROTECTION: 300V all ranges.
DC Current:
Autozero OFF Error: For r1qC and <10minutes,
Add r(8ppm of reading + range error). Refer to table below.
Range 3A 1A 100mA 10mA 1mA 100
A 10
A
Shunt
Resistance
guarantee
by design
0.1: 0.1: 1: 10: 100: 1k: 6k:
Burden
Voltage
<1.8V <0.6V <0.4V <150mV <130mV <105mV <61mV
Burden
Voltage
with 3721
card
<2.4V <1.2V <0.4V <150mV <130mV <105mV <61mV
Autozero
OFF
“of range”
Error
50PA 50PA 5PA 0.5PA 50KA 5KA 0.85KA
INPUT PROTECTION
: 3A, 250V fuse.
Thermocouples:
CONVERSITION: ITS-90.
REFERENCE JUNCTION: Internal, External, or Simulated (Fixed).
OPEN LEAD DETECTOR: Selectable per channel. Open >1.15k r50:.
Default on.
COMMON MODE ISOLATION: 300V DC or 300Vrms (425V peak for AC
waveforms), >10G: and <350UF any terminal to chassis.
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