Datasheet
SWITCHING AND CONTROL
www.keithley.com
1.888.KEITHLEY
(U.S. only)
A Greater Measure of Confidence
AC MEASUREMENT CHARACTERISTICS
AC VOLTS
MEASUREMENT METHOD: AC-coupled, True RMS.
INPUT IMPEDANCE: 1MW ±2% // by <150pF.
INPUT PROTECTION: 300VDC or 300Vrms rear inputs or 37xx cards.
AC CURRENT
MEASUREMENT METHOD: AC-coupled, True RMS.
Range
3 A 1 A 100 mA 10 mA 1 mA
Shunt Resistance
guaranteed by design
0.05 W 0.05 W 1.0 W 10 W 100 W
Burden Voltage
Rear Panel
<1.75 V rms <0.55 V rms <0.4 V rms <150 mV rms <125 mV rms
Burden Voltage
3721 Card
<2.4 V rms <1.0 V rms <0.6 V rms <200 mV rms <130 mV rms
INPUT PROTECTION: 3A, 250V fuse.
FREQUENCY AND PERIOD
MEASUREMENT METHOD: Reciprocal Counting technique.
GATE TIME: dmm.aperture=0.273→0.01. Default 0.01s.
AC GENERAL
AC CMRR
6
: 70dB.
VOLT·HERTZ PRODUCT: ≤8×10
7
Volt·Hz (guaranteed by design), ≤2.1×10
7
Volt·Hz verified. Input
frequency verified for ≤3×10
5
Hz.
AC NOTES
1. 20% overrange on AC functions except 1% on 300V and 3.33% on 3A. Default resolution is 5½ digits, maximum
useable resolution is 6½ with 7½ digits programmable.
2. Specification are for Detector Bandwidth 3 and sinewave inputs >5% of range. Detector Bandwidth 3 and 30
are multi-sample A/D conversions. Detector bandwidth 300 is a single A/D conversion, programmable from
0.0005PLC to 15PLC. Default condition set to 1PLC.
3. Applies to 0°–18°C and 28°–50°C.
4. Specified for square wave inputs. Input signal must be >10% of ACV range. If input is <20mV on the 100mV
range then the frequency must be >10Hz. For sinewave inputs, frequency must be >100Hz.
5. Applies to non-sinewave inputs 5Hz–>10kHz, and DC content ≤3% of range.
6. For 1k
W
unbalance in LO lead.
7. For Model 3721, 1mA ACI, add 0.05% to “of reading” uncertainty from 250Hz
→
10kHz.
8. Shunt resistance guaranteed by design.
9. Reading rates are for 60Hz (50Hz) operation using factory defaults operating conditions dmm.reset(“all”),
Autorange off, dmm.autodelay=dmm.OFF, dmm.opendetector=dmm.OFF, format.data.=format.SREAL. Ranges
as follows: DCV = 10V, 2W
W
/4W
W
= 1k
W
, DCI = 1mA, Dry-Ckt
W
= 10
W
, ACI = 1mA, and ACV = 1V. For Dry-
Ckt
W
with Offset Comp OFF 2k
W
, 60 rdg/s max. Dry-Ckt
W
with Offset Comp ON 2k
W
, 29.5 rdg/s max. For
temperature reading rates use DCV for T/C and 2W
W
for Thermistor. Speeds are typical and include measure-
ments and data transfer out the Ethernet, GPIB, or USB.
10. DMM configured for single reading, dmm.measurecount=1, and print(dmm.measure()). May require additional
settling delays for full accuracy, depending on measurement configuration.
11. DMM configured for multisample readings and single buffer transfer, dmm.measurecount=1000,
buf=dmm.makebuffer(1000), dmm.measure(buf), and printbuffer(1,1000,buf).
Series 3700A
System Switch/Multimeter
and Plug-In Cards
AC SPEEDS
Single Channel, 60Hz (50Hz) Operation
Detector
Bandwidth
Measurements into Buffer
9
(rdg/s) Measurement to PC
9
(ms/rdg)
Function NPLC Aperture (ms) Digits Azero On Azero Off Ethernet GPIB USB
ACI / ACV
3 N/A N/A 6½ 0.45 (0.45) N/A 2150 (2150) 2150 (2150) 2150 (2150)
30 N/A N/A 6½ 2.5 (2.5) N/A 400 (400) 400 (400) 400 (400)
300 1.0
10
16.67 (20) 6½ 42 (33) 59.5 (50) 19.4 (22.7) 19.5 (22.8) 19.8 (23.1)
300 0.2
10
3.33 (4.0) 6½ 120 (100) 295 (235) 7.6 (8.3) 6.2 (6.8) 6.4 (7.0)
300 0.06
11
1.0 (1.2) 5½ 170 (165) 935 (750) 1.40 (1.80) 1.50 (1.80) 1.60 (2.30)
300 0.006
11
0.100 (0.120) 4½ 218 (215) 6,200 (5,500) 0.55 (0.57) 0.65 (0.67) 0.75 (0.77)
300 0.0005
11
0.0083 (0.001) 3½ 218 (215) 14,600 (14,250) 0.50 (0.5) 0.60 (0.60) 0.70 (0.70)
Frequency/Period
N/A N/A 10–273 N/A
2× input period
+ gate time
N/A
2× input period +
gate time + 2.7ms
2× input period +
gate time + 2.8ms
2× input period +
gate time + 3.1ms
Series 3700A specifications
Series 3700A specifications