Keithley 3720 User Manual page 202

3706 Multimeter / Switch System
AC
1
Function Range Resolution
2
100.0000mV
Voltage
1.000000V
10.00000V
100.0000V 100PV
300.0000V
8
1.000000mA
10.00000mA
2
100KA
100.0000mA
Current
1.000000A
3.000000A
4
100.0000mV 0.333 ppm
Frequency
and Period to 3.33 ppm
300.0000V 33.3 ppm
Additional Uncertainty r(% of reading)
Low Frequency Uncertainty
20Hz – 30Hz
30Hz – 50Hz
50Hz – 100Hz
100Hz – 200Hz
200Hz – 300Hz
300Hz – 500Hz
>500Hz
Additional Uncertaintyr(% of reading)
5Hz – 10Hz
10Hz – 30Hz
30Hz – 100Hz
>100Hz
300Hz – 500Hz
•500Hz
AC MEASUREMENT CHARACTERISTICS
AC Volts
:
MEASUREMENT METHOD AC-coupled, True RMS.
INPUT IMPEDANCE:
1M:r2% // by <150UF.
:
INPUT PROTECTION 300VDC or 300Vrms rear inputs or 37xx cards.
AC Current
:
MEASUREMENT METHOD AC-coupled, True RMS.
Range 3A 1A
7
Shunt
0.1: 0.1:
Resistance
Burden
Voltage
<1.8Vrms <0.6Vrms
Rear
panel
Burden
Voltage
<2.4Vrms <1.0Vrms
3721card
INPUT PROTECTION: 3A, 250V fuse
FREQUENCY and PERIOD
:
MEASUREMENT METHOD
Reciprocal Counting technique.
GATE TIME:
SLOW 0.25s, MED 100ms, and FAST 10ms
AC General
6
:
AC CMRR 70dB
VOLT HERTZ PRODUCT:
Calibration
Cycle
0.1PV 90 Day
1PV (all ranges)
10PV 1 Year
(all ranges)
1mV
3
Temp. Coeff. /qC
1KA
10KA
90 Day / 1 Year
1PA (all ranges)
10PA
3
Temp. Coeff. /qC
Accuracy:
90 Day / 1 Year
(all ranges)
3
(3Hz –300KHz SLOW)
0
0
0
0
0
0
0
Detectorbandwidth
1 - 2
3 0.50
3 0.20
3 or 30 0.20
3 or 30 0.05
300 only 0.50
300 only 0.05
100mA 10mA 1mA
1.0: 10: 100:
<0.4Vrms <150mVrms <125mVrms
<0.6Vrms <200mVrms <130mVrms
.
(dmm.aperture=0.25, 0.1, or 0.01).
guaranteed by design),
Accuracy:
3 Hz – 5Hz –
5Hz 10Hz
1.0 + 0.03 0.30 + 0.03
1.0 + 0.03 0.30 + 0.03
0.010 + 0.003 0.030 + 0.003
3 Hz – 5Hz 5 Hz – 10Hz
1.0 + 0.04 0.30 + 0.04
1.0 + 0.04 0.30 + 0.04
1.0 + 0.04
0.30 + 0.04
1.0 + 0.04
0.30 + 0.04
1.0 + 0.04
0.30 + 0.04
0.10 + 0.004 0.030 + 0.004
r(ppm of reading r(ppm of reading
(3Hz – 500kHz) (3Hz – 500kHz)
80 +0.333 80 +0.333
80 + 3.33 80 + 3.33
80 + 33.3 80 + 33.3
Detectorbandwidth
30
(30Hz –300KHz MED)
(300Hz –300KHz FAST
0.3
0
0
0
0
0
0
Maximum Crest
Factor: 5 at full-
5
Crest Factor
2- 3
1.20
0.30
0.30
0.15
1.20
0.15
AC Notes
1. 20 % overrange except 1% on 300V and 3.33% on 3A. Default resolution is 5-½ digits;
maximum useable resolution is 6-½ with 7-½ digits programmable.
2.
Specification are for SLOW mode and sinewave inputs >5% of range. SLOW and MED are
multi-sample A/D conversions. FAST is dmm.detectorbandwidth=300 with dmm.nplc=1.0
3. Applies to 0qC - 18qC and 28qC - 50qC.
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.
6. For 1kohm unbalance in LO lead.
7. Shunt resistance guaranteed by design.
8. For Model 3721, 1mA ACI, add 0.05% to "of reading" uncertainty from 250Hz o 10kHz.
± (% of reading +
23qC r 5q
% of range)
10Hz – 20kHz –
20kHz 50kHz
0.05 + 0.03 0.11 + 0.05
0.06 + 0.03 0.12 + 0.05
0.005 + 0.003 0.006 + 0.005
10Hz –2kHz 2kHz –5kHz
0.08 + 0.03 0.09 + 0.03
0.08 + 0.03 0.09 + 0.03
0.08 + 0.03 0.09 + 0.03
0.20 + 0.03 0. 88 + 0.04
0.20 + 0.03 0. 88 + 0.04
0.005 + 0.003 0.006 + 0.005
+ offset ppm)
(333ms – 2Ps)
(SLOW, 0.25s gate)
(MED, 100ms gate)
(FAST, 10ms gate)
300
)


4.0
0.72
0.18
0.07
0
scale
3- 4 4 - 5
1.30 1.40
0.60 0.90
0.60 0.90
0.30 0.40
1.30 1.40
0.30 0.40
50kHz – 100kHz –
100kHz 300kHz
0.6 + 0.08 4.0 + 0.5
0.6 + 0.08 4.0 + 0.5
0.01 + 0.006 0.03 + 0.01
5kHz –
10kHz
0.09 + 0.03
0.09 + 0.03
0.09 + 0.03
2.0 + 0.04
2.0 + 0.04
0.006 +
0.005
.
Rev A 9/14/07