5989-5509.pdf - 第11页

Page 11 Find us at www .keysight.com Display rate Funct ion Times/second ACV 7 AC V + dB 7 DCV 7 AC + DC V 2 Ω /nS 14 Diode 14 Capacitance 4 (< 1 00 µ F ) DCI 7 ACI 7 AC + DC I 2 T emperature 6 Frequency 1 (> 1 0 H…

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Peak hold
Signal width Accuracy for DC mV/voltage/current
Single event > 1 ms 2% + 400 for all ranges
Repetitive > 250 µs 2% + 1000 for all ranges
Duty cycle and pulse width
1
Function Mode Range Accuracy at full scale
Duty cycle DC Coupling 0.01% ~ 99.99% 0.3% per kHz + 0.3%
Pulse width 500 ms 0.01 ms 0.2% + 3
2000 ms 0.1 ms 0.2% + 3
1. The positive or negative pulse width must be greater than 10 µs, and the duty cycle range should be considered.
The pulse width range is determined by the frequency of the signal.
U1252B/U1253B square wave output
Output
2
Range Resolution Accuracy
Frequency 0.5, 1, 2, 5, 6
6
, 10, 15, 20, 25,
30, 40, 50, 60, 75, 80, 100, 120,
150, 200, 240, 300, 400, 480,
600, 800, 1200, 1600, 2400,
48000 Hz
0.01 Hz 0.005% + 2
Duty cycle
3
0.39% ~ 99.60% 0.390625% 0.4% of full scale
4
Pulse width
4
1/frequency Range/256 0.2 ms + range/256
Amplitude Fixed 0 ~ +2.8 V 0.1 V 0.2 V
U1252B/U1253B frequency counter specifications
Division Range Resolution Accuracy ± (% of reading +
no. of least significant digit)
Sensitivity Min. input
frequency
Maximum
measurement
level
U1252B U1253B
1
(secondary display “-1-“)
99.999 Hz 0.001 Hz 0.02% + 3
1
0.02% + 3
1
300 mV R.M.S. 0.5 Hz < 30 Vpp
999.99 Hz 0.01 Hz 0.002% + 5, <985
kHz
0.002% + 5,
< 985 kHz
100 mV R.M.S.
9.9999 kHz 0.0001 kHz
99.999 kHz 0.001 kHz
999.99 kHz 0.01 kHz 600 mV R.M.S.
9.9999 MHz 0.0001 MHz 0.002% + 5, < 1 MHz
100
(secondary display “-100-“)
9.9999 MHz 0.0001 MHz 0.002% + 5, < 20
MHz
0.002% + 5,
< 20 MHz
600 mV R.M.S. 1 MHz
99.999 MHz 0.001 MHz 600 mV R.M.S.
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Display rate
Function Times/second
ACV 7
ACV + dB 7
DCV 7
AC + DC V 2
Ω/nS 14
Diode 14
Capacitance 4 (< 100 µF)
DCI 7
ACI 7
AC + DC I 2
Temperature 6
Frequency 1 (>10 Hz)
Duty cycle/pulse width 0.5 (>10 Hz)
Decibel (Db) calculation
dB Base Reference Default reference
1 mΩ (dBm) 1-9999 Ω 50 Ω
1 V (dBV) 1 V 1 V
Manual and interval data logging
Logging type Maximum data points
5
U1251B U1252B U1253B
Manual 100 100 100
Interval 200 200 1000
1. All frequency counters are susceptible to errors. Shielding inputs from external noise pickup is critical to minimize measurement errors. For
non-square wave signals, add 5 counts.
2. Output impedance: 3.5 kΩ maximum.
3. The positive or negative pulse width must be greater than 50 µs for adjustment of the duty cycle or pulse width under different frequencies.
Otherwise, the accuracy and range will be different from the specifications defined.
4. For signal frequencies greater than 1 kHz, an addition of 0.1% per kHz is added to the accuracy.
5. For data logging to PC, maximum number of data points is dependent on available hard disk space.
6. For the U1253B model.
Input impedance
Table A
Function Range U1251B U1252B/U1253B
DC voltage 50 mV to 1000 mV 10 MΩ 10 MΩ
5 V to 1000 V 10 MΩ (nominal), with 10 MΩ in
parallel at dual display
10 MΩ (nominal), with 10 MΩ in
parallel at dual display
AC voltage 50 mV to 1000 mV 10 MΩ in parallel with < 100 pF 10 MΩ in parallel with < 100 pF
5 V to 1000 V
AC + DC voltage 50 mV to 1000 mV N/A 10 MΩ
5 V to 1000 V 10 MΩ (nominal) in parallel with 10
MΩ, < 100 pF
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General Specifications
Display
Both primary and secondary displays are 5-digit on the LCD display.
Both the primary and secondary displays offer a maximum resolution of 50,000 counts.
Automatic polarity indication.
Connectivity
IR to USB
Power consumption
105 mVA/420 mVA (with backlight) maximum (U1251B)
165 mVA/480 mVA (with backlight) maximum (U1252B)
420 mVA maximum (U1253B)
Battery type
9 V alkaline battery (ANSI/NEDA 1604A or IEC 6LR61)
9 V carbon-zinc battery (ANSI/NEDA 1604D or IEC6F22)
7.2 V or 8.4 V Ni-MH rechargeable battery
Battery life
U1251B: 72 hours typical
U1252B: 36 hours typical
U1253B: 8 hours typical
Operating environment
– Full accuracy at –20 °C to 55 °C ; and to 80% RH for temperatures up to 35 °C,
decreasing linearly to 50% RH at 55 °C
– 0 to 2000 m altitude per IEC 61010-1 2nd Edition CAT III, 1000 V/CAT IV, 600 V
Storage compliance
–40 °C to 70 °C with battery removed
Measurement category
CAT III 1000 V / CAT IV 600 V
Regulatory
Refer to Declaration of Conformity for the latest revisions of regulatory compliance at:
http://www.keysight.com/go/conformity
Common mode rejection ratio (CMRR)
U1251B/U1252B: >90 dB at DC, 50/60 Hz ± 0.1% (1 kW unbalanced)
U1253B: >100 dB at DC, 50/60 Hz ± 0.1% (1 kW unbalanced)
Normal mode rejection ratio (NMRR)
U1251B/U1252B: >60 dB at DC, 50/60 Hz ± 0.1%
U1253B: >90 dB at DC, 50/60 Hz ± 0.1%
Temperature coefficient
0.15 * (specified accuracy)/°C (from -20 °C to 18 °C or 28 °C to 55 °C)
Shock and vibration
Tested to IEC/EN 60068-2
Dimensions (HxWxD)
203.5 mm x 94.4 mm x 59.0 mm
Weight
U1251B: 504±5 g with battery
U1252B/U1253B: 527±5 g with battery