Fluke DP120 User manual

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®
DP120
Differential Voltage Probe
Instruction Sheet
Introducing the DP120
The DP120 is a safety designed differential voltage probe for
floating high voltage measurements. The probe can be used on
electronic high-power converters, motor speed controls, switch
mode power supplies, and other high voltage circuits.
Unpacking
Check that the following items are included with the DP120:
• DP120 - Differential Voltage Probe
• AC85A - Large Jaw Alligator Clips (red and black)
• AC83 - Pin-Grabber Test Clips (red and black)
• 9V Alkaline Battery
LIMITED WARRANTY & LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and
workmanship for one year from the date of purchase. This warranty
does not cover fuses, disposable batteries or damage from
accident, neglect, misuse or abnormal conditions of operation or
handling. Resellers are not authorized to extend any other warranty
on Fluke’s behalf. To obtain service during the warranty period,
send your defective product to the nearest Fluke Authorized
Service Center with a description of the problem.
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER
WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS NOT
LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM
ANY CAUSE OR THEORY.
Since some states or countries do not allow the exclusion or
limitation of an implied warranty or of incidental or consequential
damages, this limitation of liability may not apply to you.
Fluke Corporation Fluke Industrial B.V.
P.O. Box 9090 P.O. Box 680
Everett WA 7600 AR Almelo
98206-9090, USA The Netherlands
April 1997, Rev. 5, 4/99
© 1997, 1999 Fluke Corporation
All rights reserved.
Printed in the Netherlands
All product names are trademarks of their respective companies.
Using the DP120 Safely
In this manual a Warning identifies conditions and actions that
pose hazards to the user. Symbols used on the DP120 and in this
instruction sheet are explained in the next table.
See explanation in
manual
Conformité
Européenne
Double Insulation
(Protection class)
UL3111 listed
Recycle
Warning
Do the following to avoid electrical shock or fire if the
probe is connected to more than 42V peak (30V rms):
• Use only Fluke power adapter, model PM8907
(option).
• Connect the power adapter to the AC outlet
before connecting it to the DP120.
• Do not insert metal objects in the power adapter
connector.
• Use 600V rated test lead adapters. The maximum
allowable input voltage is 600V, Category III.
Powering the DP120
Follow the procedure (steps 1 to 3) to power the probe from a
standard ac outlet.
The power adapter is optional. For available Power Adapter
models, see the section ‘Servicing the DP120’.
Storing the DP120
If you are storing the differential voltage probe for an extended
period of time, the battery should be removed and stored
separately.
Using the DP120
To use the differential voltage probe, do the following:
Connect the probe’s output cable to the desired input on
the test tool. For Fluke 123, use the black banana-to-
BNC adapter (BB120).
ôOn the probe, select the 200x range. Ensure that the
green POWER ON-indicator is lit.
íOn the test tool, ensure that the probe correction is set to
200:1. If not available, set to 100:1.
÷Connect both probe inputs to the measuring points.
ûWhen the test tool is not in auto range, adjust the vertical
range for optimal display.
øWhen using the 100:1 probe correction, multiply the
voltage reading on the screen by 2x.
ùAt completion, be sure to set the range selection switch
to OFF again.
Measurement tips:
• Use the 20x range on the differential voltage probe for smaller
signals, such as ripple on a high voltage reference lead.
• At 20x range, set the test tool range to 20:1 (or 10:1).
• When the probe is battery operated, the red LED indicates
that the battery level is low and the battery needs to be
replaced.
• When battery operated, the probe automatically goes to
standby mode after 30 minutes to conserve battery power. A
blinking green LED indicates that the probe is in standby
mode. To continue operation, turn the range selection switch
from OFF to 20x or 200x.
• Connect the red probe cable to a higher voltage level than the
black probe cable.
• For a dual measurement on test tool inputs A and B, connect
the common to earth ground. This ensures optimal
measurement accuracy on all inputs. For operating and
grounding principles of the differential voltage probe, see the
next figure.
Application of Testing an Adjustable
Speed Drive Timing Circuit
One of the tasks of the control circuitry in an adjustable speed drive
(ASD) is timing of the output inverter switching. The voltage
waveform of the pulse width modulated (PWM) output inverter is a
series of pulses of constant magnitude (height), but varying width.
The control circuitry manages the timing of these pulses.
When one of the stages of the output inverter does not function
properly, check the following:
• the output stage
• the control circuitry
The figure below shows how to connect a ScopeMetertest tool
and a DP120 to the circuitry.
DCVOLTAGE
TOMOTOR
_
+
Note that the timing circuit for the FET (Field Effect Transistor)
drive is referenced to earth ground. The gate drive signal is isolated
with a transformer coupling to the FET, which is connected to the
DC-voltage.
An example of comparing the timing signal to the signal at the drive
output can be seen in the screen below.

Installing or Replacing the Battery
Replace the battery when the red LED lights, or when both red and
green LEDs are off when the probe is turned on.
Warning
To avoid electrical shock, disconnect the differential
voltage probe from any conductor, and disconnect
the ScopeMeter®test tool or oscilloscope before
replacing the battery.
Follow the procedure (steps 1 to 5) to install or replace the battery.
Characteristics
FLUKE guarantees the properties expressed in numerical values
with the stated tolerance. Specified non-tolerance numerical values
indicate those that could be nominally expected from the mean of a
range of identical differential voltage probes.
Input Characteristics
Input Probe Tip Style: Shrouded banana probe tip
Probe Cable Length: 1.5 meter (60 inch)
Maximum Input Voltage to Ground:
600V CAT III
1000V CAT II
Installation Category III refers to distribution level and fixed
installation circuits inside a building. Installation Category II refers
to local level, which is applicable for appliances, and portable
equipment.
Maximum Differential Input Voltage:
1000 VDC, or
1000 Vrms, or
1200V (DC+AC peak)
Note
(DC+AC peak) limit is determined by the point at which
the differential voltage probe starts clipping.
For derating of each input probe (red or black), see figure below.
Output Characteristics
Output Cable: Safety designed BNC cable
Cable Length: 0.5 meter (20 inch)
Max. Output Voltage Range: ±6.5V into 1 MΩ
Electrical Characteristics
Attenuation: 200x and 20x
Bandwidth: (into 1 MΩ, 50 pF)
200x: DC to 20 MHz (-3 dB)
20x: DC to 20 MHz (-3 dB)
Accuracy: ±2.5% into 1 MΩ
Rise time:
200x: 17.5 ns
20x: 17.5 ns
CMRR:
200x: @60Hz= >80 dB, @1 MHz= >50 dB
20x: @60Hz= >70 dB, @1 MHz= >40 dB
Input Impedance:
Between each input to shielding BNC: 5 MΩ, 6 pF
Between the inputs: 10 MΩ, 5 pF
Output Impedance: 50Ω
Noise:
200x: <2 mVrms
20x: <3 mVrms
Offset: ≤10 mV into 1 MΩ
Switch positions: OFF, 200x, 20x
Power
External:
Via power adapter PM8907 (optional)
Internal:
Battery Power: Alkaline 9V, IEC6LR61
Battery Life: 8 hour operation
400 hour in auto standby
Battery life measured @ 25 ° C with Duracell
®
alkaline
battery. (Delivered with probe.)
Power indicators:
Green LED: ON at normal operation.
blinks at standby.
To change from standby to normal operation turn switch
from OFF to 20x or 200x.
Red LED: ON when battery needs to be replacing.
Auto Stand By:
After 30 minutes, only when battery operated.
Environmental
Meets requirements of:
MIL-T-28800E, Type III, Class 3.
EN 50081-1, Electromagnetic Compatibility Generic Emission
Standard: EN55022 and EN60555-2.
EN 50082-2, Electromagnetic Compatibility Generic Immunity
Standard: IEC801-2, -3, -4, -5. (see also Tables 1 and 2)
This product is in conformity with Electromagnetic Compatibility
Directive 89/336/EEC and Low Voltage Directive 73/23/EEC.
This conformity is indicated by the symbol , i.e. “Conformité
Européenne”.
Temperature:
Operating: 0°C to +50°C (+32°F to +122°F)
Storage: -10°C to +60°C (+14°F to +140°F)
Altitude:
Operating: 3 km (9850 feet)
Storage: 12 km (40 000 feet)
Safety Specifications
Meets requirements of:
EN61010-2-31 (IEC1010-2-31).
Compliant with:
UL3111-1 (including listing)
CSA C22.2 No.1010.1-92 (including approval)
Max. Floating Output Voltage:
600V Category III, up to 400 Hz. (From shielding to ground.)
The DP120 conforms with the EEC directive 89/336 for EMC
immunity, as defined by IEC801-3, with the addition of the following
tables.
Table 1
Susceptibility
(in % of full dynamic range)
Frequency range:
10 kHz to 25 MHz
E = 3 V/m E = 10 V/m
20x <1% <1%
200x <1% <1%
Table 2
Susceptibility
(in % of full dynamic range)
Frequency range:
25 MHz to 1 GHz
E = 3 V/m E = 10 V/m
20x ≤1% ≤2%
200x ≤1% ≤2%
Servicing the DP120
For service information, contact your Fluke service center. To
locate an authorized service center, visit us on the World Wide
Web:
http://www.fluke.com
or call Fluke using any of the phone numbers listed below:
[phone] in U.S.A. and Canada
[phone] in Europe
[phone] from other countries
Available power adapters:
Model Description
PM8907/801 Universal Europe 230V, 50 Hz
PM8907/803 North America 120V, 60 Hz
PM8907/804 United Kingdom 240V, 50 Hz
PM8907/806 Japan 100V, 60 Hz
PM8907/807 Australia 240V, 50 Hz
PM8907/808 Universal 115V/230V
Note
The 230V rating of the PM8907/808 is not for use in
North America. A line plug adapter complying with the
applicable National Requirements may be provided to
alter the blade configurations for a specific country.
Service sheet:
Ordering Number: 4822 872 05374