AMPROBE PM51A Service Manual
PM51A
The ultimate shirt-pocket DMM with frequency & capacitance
Pocket Digital Multimeter with Frequency & Capacitance
• Measures ac and dc
voltage, resistance,
continuity with beeper,
capacitance and
frequency
• Fully autoranging with 7
measurement functions
and 27 ranges
• Complete safety ratings
of CAT III 300 V, CAT II
600 V and UL and CSA
listing
• Large oversize digital
display with measurement results and the
unit icon
• Data Hold freezes
measurement value on
the display
• One-year, no-hassle
warranty
This shirt-pocket sized meter is
only 3/8" thick and weighs less
than 3 oz. With full functionality
offering ac and dc voltage to
600 V, resistance to 40 Megohm,
capacitance to 3000 µF, frequency
to 1 MHz
, continuity w/beeper,
and diode test.
Fully autoranging, this meter
offers seven different measure-
ment functions with 27 full ranges
of measurement. The digital
display is oversized with large
digits and annunciators. In spite of
its size, this meter is fully safety
rated to CAT III 300 V, CAT II 600 V
and is UL listed.
No other meter
offers this small size with such
performance and high safety
ratings.
PM51A Specifications
DC Voltage
Range Accuracy
400.0 mV ± (1.0 %+2 dgt)
4.000 V, 40.00 V, 400.0 V ± (2.0 %+2 dgt)
600 V ± (2.5 %+4 dgt)
NMRR > 50 dB @ 50 Hz/60 Hz
CMRR > 120 dB @ dc, 50 Hz/60 Hz; Rs=1 kΩ
Input impedance 10 MΩ, 30 pF nominal; (1000 MΩ for 400.0 mV range)
AC Voltage
Range Accuracy
50 Hz - 60 Hz
4.000 V, 40.00 V, 400.0 V ± (2.0 %+5 dgt)
60 Hz - 500 Hz
4.000 V
5
0 Hz - 500 Hz
600 V ± (3.5 %+5 dgt)
Input impedance 1
CMRR > 60 dB @ dc to 60 Hz, Rs=1 kΩ
Capacitance
1
ange
R
00.0 nF, 5.000 µF, 50.00 µF,
5
500.0 µF, 3000 µF
1
Additional 50.00 nF range accuracy is not specified
2
acies with film capacitor or better.
ccur
A
3
Updates > 1 minute on large values
4
Specified with battery voltage above 2.8 V (half full battery). Accuracy decreases gradually to 12% at
low battery warning voltage of appr
Resistance
Range Accuracy
400.0 Ω ± (1.5 %+6 dgt)
4.000 KΩ, 40.00 KΩ, 400.0 KΩ ± (1.0 %+4 dgt)
4.000 MΩ ± (1.5 %+4 dgt)
40.00 MΩ ± (2.5 %+4 dgt)
Open circuit voltage 0.4 V dc typical
, 400.0 V ± (3.0 %+5 dgt)
, 40.00 V
3
0 M
0 pF nominal
Ω, 3
2
y
ac
ccur
A
± (3.5 %+6 dgt4)
.
ox 2.4 V
PM51A
The ultimate shirt-pocket DMM with frequency & capacitance
PM51A Specifications cont.
Frequency
1
Range
400 Hz, 4 kHz, 40 kHz,
400 kHz, 1 MHz
1
Specified at input voltage < 20 V ac rms input signal: Sine-wave, or square-wave with duty cycle
> 40 % & < 70 %
Sensitivity (V-peak)
5 Hz - 100 kHz > 1.3 Vp
00 kHz - 500 kHz > 2.2 Vp
1
00 kHz - 1 MHz > 4.2 Vp
5
Diode Tester
Test current (typical) 0.25 mA
cuit voltage
Open cir
Audible Continuity Tester
Open circuit voltage 0.4 V dc typical
Audible threshold 65 Ω ±55 Ω
General Specifications
Display and update rate 3-3/4 digits 4000 counts; Updates 3 per second nominal
Operating temperature 0 ˚C - 40 ˚C
Relative humidity Max. 80 % R.H. up to 31 °C, decreasing linearly to 50 % R.H. at 40 ˚C
Altitude Operating below 2000 m
Storage temperature -20 ˚C ~ 60 ˚C, < 80 % R.H. (with battery removed)
Temperature coefficient Nominal 0.15 x (specified accuracy)/ ˚C @ (0 ˚C ~ 18 ˚C or
Sensing Average sensing
Overload protection 600 V dc and V ac rms
Low battery Below approx. 2.4 V
Power supply 3 V standard button battery x 1 (IEC-CR2032; ANSI-NEDA-5004LC)
Power consumption (typical) 2 mA
Automatic Power Off
(APO) timing Idle for 3
APO consumption (typical) 2.2 µA
Dimension L 113 mm x W 53 mm x H 10.2 mm (4.4 x 2.1 x 0.4 in)
Weight Approx. 78 gm (3 oz)
Special features Data Hold, and 30 ms MAX Hold
Agency approvals CE, cULus
Safety Meets IEC61010-1, UL61010B-1, CAN/CSA-C22.2 No. 1010.1-92,
E.M.C. Meets EN61326
A
c
cessories
Included Battery installed, and User’s manual
Optional H-PM pr
Accuracy
(0.5 %+4 dgt)
±
1.6 V dc
28 ˚C ~ 40 ˚C), or otherwise specified
0 minutes
ollution Degr
, P
00 V
T II 600 V and CA
CA
otectiv
T III 3
e holster
, and VC3 zipper
ee 2, Class 2
ed carrying case
Pocket Digital Multimeter with Frequency & Capacitance
Amprobe® Test Tools
website: www.Amprobe.com
email: info@ampr
0 Sea
692
Everett, WA 98203
tel: 877-AMPROBE
Amprobe® Test Tools Europe
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
©2006 Amprobe Test Tools. All rights reserved.
Printed in U.S.A. 12/2006 2277152 D-US-N RevB
obe.com
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