5989-5509.pdf - 第12页

Page 12 Find us at www .keysight.com Gener al Spe cifications Dis play Bot h primar y and seconda ry displ a ys are 5 -digit on t he LCD display. Bot h the primar y and seco ndary di splays offer a m aximum resolu tion o…

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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
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Ordering Information
Optional Accessories
Measuring accessories (non-temperature)
U1251B U1252B U1253B
U1161A extended test lead kit
Includes two test leads (red and black),
two test probes, medium-sized alligator clips
and 4-mm banana plugs.
• Test leads: CAT III 1000 V, CAT IV
600 V, 15 A
• Test probes: CAT lll 1000 V, CAT lV
600 V, 15 A
• Medium sized alligator clips: CAT III 1000 V,
CAT IV 600 V, 15 A
• 4-mm banana plugs: CAT II 600 V, 10 A
U1162A alligator clips
• One pair of insulated alligator clips
(red and black). Recommended for use with
Keysight standard test leads.
• Rated CAT III 1000 V, CAT IV 600 V, 15 A.
U1163A SMT grabbers
• One pair of SMT grabbers (red and black).
Recommended for use with Keysight standard
test leads.
• Rated CAT II 300 V, 3 A.
U1164A fine-tip test probes
• One pair of fine-tip test probes (red and black).
Recommended for use with Keysight standard
test leads.
• Rated CAT II 300 V, 3 A.