Keithley 2002, Calibration Manual, Page: 80 / 114

Specifications A-11
Frequency Counter
Frequency/Period Input Characteristics and Accuracy
90 Days, 1 Year, or 2 Years
Frequency Period Minimum Signal Level 2 Maximum Trigger Accuracy
Range 1 Range Resolution 1Hz–1MHz 1–5MHz 5–15MHz Input Level
±
(% of reading)
AC Voltage Input 1Hz–15 MHz 67 ns – 1 s 5 digits 60 mV 60 mV 350 mV 1100 V pk 1 0–600V 0.03
AC Current Input 1Hz– 1 MHz 1
µ
s – 1 s 5 digits 150
µ
A 1 A pk 0–600mA 0.03
Time Base 7.68MHz
±
0.01%, 0
°
C to 55
°
C.
Reading Time 420ms maximum.
Voltage Input Impedance 1M
Ω ±
2% with <140pF.
Trigger Level Adjustment Trigger level is adjustable in 0.5% of range steps to
±
60% of
range in real-time using the up and down range buttons.
Frequency Ranging Autoranging from Hz to MHz.
Frequency Coupling AC + DC or AC only.
Frequency Notes
1 Subject to 2
×
10 7 V·Hz product (for inputs above 20V).
2 Valid for the lowest range. For each range increase,
multiply these numbers by 10.
Temperature (RTD)
Temperature Notes
4-Wire Accuracy 5
Range Resolution 24 Hours
2
90 Days
3
1 Year
3
2 Years
3
–100
°
to +100
°
C 0.001
°
C
±
0.016
°
C
±
0.020
°
C
±
0.021
°
C
±
0.022
°
C
–200
°
to +630
°
C 0.001
°
C
±
0.061
°
C
±
0.066
°
C
±
0.068
°
C
±
0.070
°
C
–148
°
to +212
°
F 0.001
°
F
±
0.029
°
F
±
0.036
°
F
±
0.038
°
F
±
0.040
°
F
–328
°
to +1166
°
F 0.001
°
F
±
0.110
°
F
±
0.119
°
F
±
0.122
°
F
±
0.126
°
F
RTD Type 100
Ω
platinum, DIN 43760, 4-wire. ITS-90 (PT100, D100, F100)
and IPTS-68 (PT385, PT3916).
Sensor Current 960
µ
A (pulsed).
Temperature Coefficient
±
0.001
°
C/
°
C or
±
0.002
°
F/
°
C outside T
CAL
±
5
°
C.
Maximum Source
HI Lead Resistance 200
Ω
.
Maximum Source
LO Lead Resistance 100
Ω
.
RTD Temperature Reading Rates 1 (2- or 4-Wire)
Readings or Readings with
Time Stamp/Second
to Memory or IEEE-488
PLC Autozero Off Autozero On
10 3 (2.5) 1 (0.8)
2 12 (10) 4 (3.3)
1 20 (16) 17 (13)
0.1 51 (49) 41 (39)
0.01 58 (58) 46 (46)
Temperature (Thermocouple)
Thermo-
couple
Type Range Resolution Accuracy 4
J –200
°
to + 760
°
C 0.001
°
C
±
0.5
°
C
K –200
°
to +1372
°
C 0.001
°
C
±
0.5
°
C
T –200
°
to + 400
°
C 0.001
°
C
±
0.5
°
C
E –200
°
to +1000
°
C 0.001
°
C
±
0.6
°
C
R 0
°
to +1768
°
C 0.001
°
C
±
3
°
C
S 0
°
to +1768
°
C 0.001
°
C
±
3
°
C
B +350
°
to +1820
°
C 0.001
°
C
±
5
°
C
TC Temperature Reading Rates 1
Readings/Second
Readings/Second Readings/Second with Time Stamp
to Memory to IEEE-488 6 to IEEE-488 6
Autozero Autozero Autozero
PLC Off On Off On Off On
10 6 (5) 2 (1.7) 6 (5) 2 (1.6) 6 (5) 2 (1.6)
2 29 (25) 9 (7.6) 29 (24) 9 (7.4) 27 (22) 9 (7.4)
1 57 (48) 47 (40) 56 (46) 46 (38) 50 (41) 42 (34)
0.1 131 (126) 107 (103) 100 (96) 84 (81) 83 (80) 72 (69)
0.01 168 (168) 112 (112) 121 (121) 89 (89) 96 (96) 74 (74)
4 Relative to external 0
°
C reference junction; exclusive of
thermocouple errors. Junction temperature may be
external. Applies for 90 days, 1 year or 2 years, T
CAL
±
5
°
C.
5 Specifications are for 10 power line cycles, autozero on,
10 reading repeat digital filter, 4-wire mode. Exclusive of
RTD probe errors.
6 Using Internal Buffer.
1 For on-scale readings, no trigger delays, digital filter off,
display off, normal autozero, internal trigger, SREAL
format. These rates are for 60Hz and (50Hz). Rates for
400Hz equal those for 50Hz. Typical values.
2 For T
CAL
±
1
°
C, following 4-hour warm-up.
3 For T
CAL
±
5
°
C, following 4-hour warm-up.