1880
Milliohmmeter
Instruction Manual
Form 150046/A2
QuadTech, Inc., 1993
5 Clock Tower Place, 210 East
Maynard, Massachusetts, U.S.A. 01754
October 2000
Telephone 978-461-2100
Sales 800-253-1230
Facsimile 978-461-4295
Website www.quadtech.com
The material in this manual is for informational purposes only and is subject to change, without
notice. QuadTech assumes no responsibility for any error or for consequential damages that may
result from the misinterpretation of any procedures in this publication.
WARNING
Potentially dangerous voltages may be present on front and rear panel terminals. Follow all
warnings in this manual when operating or servicing this instrument. Dangerous levels of energy
may be stored in capacitive devices tested by this unit. Always make sure the high voltage
indicator is not on when connecting or disconnecting the device under test.
!
Product will be marked with this symbol (ISO#3684) when it is necessary for the user to
refer to the instruction manual in order to prevent injury or equipment damage.
Product marked with this symbol (IEC417) indicates presence of direct current.
Product will be marked with this symbol (ISO#3684) when voltages in excess of 1000V
are present.
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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Page 2 of 28
Contents
Warranty ........... ........... ...................................................................................5
Specifications ........... ........... ...................................................................................7
Introduction - Section 1
1.1 Product Overview...... ................................................................................... 9
1.2 Controls and Indicators ................................................................................. 10
1.3 Accessories Included. ...................................................................................13
1.4 Accessories/Options Available .....................................................................13
1.5 Power Requirements . ...................................................................................14
Operation - Section 2
2.1 Startup ........... ........... ...................................................................................15
2.2 Instrument Zeroing.... ................................................................................... 15
2.3 Connection to Device Under Test.................................................................17
2.4 Measurement Procedure................................................................................ 17
2.5 Measurement Range Selection...................................................................... 18
2.6 Trigger Selection....... ...................................................................................18
2.7 Measurement Speed Selection ......................................................................19
2.8 Display Selection....... ...................................................................................19
2.9 Limit Setting.. ........... ...................................................................................19
2.9.1 General.......... ...................................................................................19
2.9.2 Setting Nominal Value...................................................................... 19
2.9.3 Setting %....... ...................................................................................20
2.9.4 Enabling Pass/Fail Limits..................................................................20
2.10 Pass/Fail Alarm Setting.................................................................................20
2.11 Input/Output Interface21
2.11.1 Handler Interface............................................................................... 21
2.11.2 IEEE-488 Interface Option................................................................ 22
2.11.3 IEEE-488 Address Setting.................................................................22
2.11.4 IEEE-488 Commands........................................................................ 23
2.11.5 Output Data Format........................................................................... 24
2.11.6 Sample Program for IEEE-488..........................................................25
2.12 Operation with 1880-52 Test Fixture & Cable.............................................. 25
Service & Calibration - Section 3
3.1 General.......... ........... ...................................................................................27
3.2 Instrument Return...... ...................................................................................27
3.3 Error Messages.......... ................................................................................... 28
Page 3 of 28
Page 4 of 28
Warranty
echuad
T
QuadTech warrants that Products are free from defects in material and workmanship and,
when properly used, will perform in accordance with QuadTech's applicable published
specifications. If within one (1) year after original shipment it is found not to meet this
standard, it will be repaired, or at the option of QuadTech, replaced at no charge when
returned to a QuadTech service facility.
Changes in the Product not approved by QuadTech shall void this warranty.
QuadTech shall not be liable for any indirect, special or consequential damages,
even if notice has been given of the possibility of such damages.
This warranty is in lieu of all other warranties, expressed or implied, including, but
not limited to any implied warranty or merchantability or fitness for a particular
purpose.
SERVICE POLICY
QuadTech policy is to maintain product repair capability for a period of five (5) years
after original shipment and to make this capability available at the then prevailing
schedule of charges.
Page 5 of 28
Page 6 of 28
Specifications
Resistance
Range F.S. Resolution Accuracy* I
V
TEST
CLAMP
20m 1 (0.1% + 1ct) 1A 1.0V
200m 10 (0.05% + 1ct) 100mA 1.0V
2
100 (0.05% + 1ct) 100mA 1.0V
20 1m (0.05% + 1ct) 10mA 1.0V
200 10m (0.05% + 1ct) 1mA 4.5V
2k 100m
(0.05% + 1ct) 100A 4.5V
20k 1 (0.05% + 1ct) 100A 4.5V
200k 10
(0.05% + 1ct) 10A 4.5V
2M 100 (0.05% + 1ct) 1A 4.5V
* Accuracy specified at: 18C - 28C
Temperature Coefficient: 0C - 18C and 28C - 50C
(0.25 x accuracy) / C
Measure Rate: 2.5 or 5 measurements/sec
Limit Detection: High/Low value comparator,
Value and % from nominal
Display: Digital: Measured resistance (4 1/2 digits)
Interfaces: Handler (standard)
IEEE-488 (optional)
Front Panel Input Terminals: Multi-pin 4-terminal Kelvin Connector
Mechanical: Bench mount with tilt bail
Dimensions: (w x h x d)
(10.5 x 5 x 14in)
(270 x 120 x 350mm)
Weight: 11lbs (5kg) net
17lbs (8kg) shipping
Page 7 of 28
Specifications (Continued)
Environmental: Operating 0 to + 50C
Storage - 20 to + 70C
Humidity < 85%
Power Requirements: 115 or 230VAC 50/60 Hz 25W Max
Accessories Instruction Manual Calibration Certificate
Supplied: AC Power Cable 1880-50: 1-Meter Cable Set
Accessories 1880-01 IEEE Interface (factory installed)
Available: 1880-50 Cable Set, 1 meter (included standard)
1880-51 Cable Connector
1880-52 Test Fixture and Cable
1880-70 IEEE Interface (field retrofit)
Ordering Information: Description Catalog Number
1880 Milliohmmeter 1880-00
1880-50
Kelvin Clip Lead Set
Figure S-1: 1880-50 Cable Lead Set
1880-52
4-BNC to Axial/Radial Adaptor
Figure S-2: 1880-52 Lead Set
I-
P-
P+
I+
I-
P-
P+
I+
Page 8 of 28
Section 1: Introduction
1.1 Product Overview
The 1880 Milliohmmeter is ideally suited for a wide variety of low-ohm resistance
measurements of switches, relays, connector contacts, printed circuit board tracks and
other resistive items. The instrument offers nine measurement ranges from 2M to 1
over seven current ranges from 1A to 1A. A basic measurement accuracy of 0.05%
coupled with a fast measurement speed of 5meas/sec and built-in comparator for
Go/NoGo testing makes the unit ideal for fast and precise testing in a production
environment.
A handler interface and optional IEEE-488 interface are also available to adapt the
instrument for production and automatic system applications.
The instrument is supplied in a bench configuration, i.e., in a cabinet with resilient feet
for placement on a table. A bail is provided under the front edge so that the instrument
can be tilted back for convenient operator viewing.
QuadTech
REMOTE
POWER
ON
OFF
1880 MILLIOHMMETER
123.45
mk
TEST
M
TEST SETUP
VALUE
FAST
SLOW
RANGE
DOWN
AUTO%UP
ZERO INT
TRIGGER
DISPLAY
SPEED
MAN/EXT
LIMIT SET
NOMINAL VALUE
1 0 0 0 0
0 2 0
ENABLEFAIL LO FAIL HIPASS
HIGH LIMIT(+)%LOW LIMIT(-)%
0 5 0
Figure 1-1: 1880 Milliohmmeter
Introduction Page 9 of 28
1.2 Controls and Indicators
Figure 1-2 illustrates the controls and indicators on the front panel of the 1880
Milliohmmeter. Table 1-1 identifies them with description and function.
1315 1417 161819
Q
uadTech
REMOTE
POWER
ON
OFF
16432
MILLIOHMMETER
1880
3.755
m
k
M
TEST
DISPLAY
%VALUE
SPEED
SLOWFAST
RANGE
AUTODOWN
INT.ZERO
UP
MAN/EXT
TRIGGER
8
LIMIT SETTEST SET UP
FAIL LO PASS FAIL HI
NOMINAL VALUE
30 000
LOW LIMIT (-) % HIGH LIMIT (+) %
200 200
ENABLE
..
109
75
Figure 1-2: Front Panel Controls
Table 1-1: Front Panel Controls and Indicators
Reference #
Name Type Function
Figure 1-2
1 POWER Red Push Button
Switch
2 TEST Black Receptacle for
Hirose Electric Plug
Applies AC power to unit:
In=On Out=Off
Provides 4-Terminal
Kelvin Connection to DUT
(RM12BPG-5P)
3 DOWN Black P-B Switch Count down through 9
measurement ranges in
Manual Mode
4 ZERO Black P-B Switch with
red LED
5 AUTO Black P-B Switch with
red LED
Initiates test lead or fixture
error correction when lit
Instrument will select
measurement range when
LED is lit
6 INT. Black P-B Switch with
red LED
Continuous internal
measurement trigger
12
11
Page 10 of 28 Introduction
Table 1-1: Front Panel Controls and Indicators (Continued)
Reference #
Name Type Function
Figure 1-2
7 UP Black P-B Switch Count up through 9
measurement ranges in
Manual Mode
8 MAN/EXT Black P-B Switch with
red LED
9 LOW
LIMIT
10 HIGH
LIMIT
11 NOMINAL
VALUE
3-digit Thumb Wheel
Switch
3-digit Thumb Wheel
Switch
5-digit Thumb Wheel
Switch
12 ENABLE Black P-B Switch with
red LED
Manual measurement
trigger when LED is lit
Set Low Limit value in %
Set High Limit value in %
Set Nominal Value
(Decimal)
Enable Limit Function
when LED is lit
13 FAIL HI Red LED When lit, measured value
exceeds High Limit
14 PASS Green LED When lit, measured value
is within High & Low
Limits
15 FAIL LO Red LED When lit, measured value
exceeds Low Limit
16 SPEED Black P-B Switch Select Fast (5meas/sec) or
Slow (2.5meas/sec)
17 DISPLAY Black P-B Switch Select Display Value in
Decimal or % (In order to
select &, Limit must be
ENABLED)
18 Display 4-1/2 Digital Display
4 Green LEDs
Indicates Measured Value
with unit (LED indicators)
19 REMOTE Red LED When lit, instrument is
remotely controlled via
IEEE-488 Interface
Introduction Page 11 of 28
Figure 1-3 illustrates the controls and connectors on the rear panel of the 1880
Milliohmmeter. Table 1-2 identifies them with description and function.
10 9 8
ON
14352786
ADDRESS
ALARM
SIGNAL
GOOD
NO GOOD
ALARM
VOLUME
230 115
LINE VOLTAGE
SELECTED
FUSE
115V 1/4A
230V 1/8A
SLOW BLOW
IEEE 488 INTERFACE
HANDLER INTERFACE
CALIBRATION
DISABLE
ENABLE
1432576
Figure 1-3: Rear Panel Controls and Connectors
Table 1-2: Rear Panel Connectors and Controls
Reference #
Name Type Function
Figure 1-3
1 HANDLER DB9 (9-pin) female
connector
2 CALIBRATION For Use by
Qualified Service
I/O connection for
component handler
Enable/Disable
Calibration function
Personnel ONLY.
Improper use will
alter instrument
calibration.
3 ALARM SIGNAL Audible output
activated for Pass/Fail
4 ALARM
VOLUME
5 LINE VOLTAGE
SELECTED
Silver rotary switch Controls loudness of
P/F alarm. Off/On
Red 2-position slide
switch
Select AC power
source: 115V or 230V
QuadTech
AC LINE INPUT
SINGLE PHASE
Page 12 of 28 Introduction
Table 1-2: Rear Panel Connectors (Continued)
Reference #
Name Type Function
Figure 1-3
6 FUSE Black screw cap AC input power fuse:
0.25A for 115V use
0.125A for 230V use
7 AC LINE INPUT Black 3-prong
receptacle
8 No Name Black Hole
(It really is!)
9 ADDRESS Blue 8, 2-position
DIP switches
10 IEEE-488 Blue 24-pin
connector
3-wire connection for
AC power source
Audible output for
Pass/Fail Alarm
Address Switches for
IEEE-488 interface
I/O connection for
IEEE-488 interface
1.3 Accessories Included
Table 1-3: Accessories Included
Item Quantity
Instruction Manual 1
Calibration Certificate 1
AC Power Cable 1
1-Meter Cable Set 1
1.4 Accessories/Options Available
Table 1-4: Optional Accessories
Item Part Number
IEEE-488 Interface (factory installed) 1880-01
Cable Set, 1 meter 1880-50
(Included standard with unit)
Cable Connector 1880-51
(For custom interface connections
Mates with front panel connector)
Test Fixture and Cable (for leaded devices) 1880-52
IEEE-488 Interface (field retrofit) 1880-70
Introduction Page 13 of 28
1.5 Power Requirements
The 1880 Milliohmmeter can be operated from either a 115V or 230V power line source.
Power connection is vi a the rear panel through a standard AC 3-wire receptacle. Before
connecting the 3-wire power cord between the unit and AC power source make sure the
voltage selection switch on t he rear panel and the fuse are in accordance with the power
source being used. For a 115V AC source use a 0.25A SB fuse. For a 230V AC source
use a 0.125A SB fuse. Always use an outlet that has a properly connected protection
ground.
To Change A Fuse:
WARNING
MAKE SURE THE UNIT HAS BEEN DISCONNECTED FROM ITS AC POWER SOURCE FOR
AT LEAST 5 MINUTES BEFORE PROC EEDING
.
Make sure the power switch is OFF and the power cord is
disconnected from the unit and the AC power source.
Inspect if the fuse is functional by measuring resistance (< 15) with
an ohmmeter.
Using a flat head screwdriver, turn the screw cap about 60
counterclockwise. The screw cap should protrude about 3.0cm from
the socket.
Remove screw cap. Replace with new fuse.
Replace screw cap in 1880 unit and turn the screw cap about
60clockwise.
Switch Voltage Selector to proper power source: 115V or 230V
Page 14 of 28 Introduction
Section 2: Operation
2.1 Startup
Check to make sure the line voltage marking on the rear panel agrees with the AC power
source available (Switch position to the left for 115V and to the right for 230V).
Connect the instrument power cord to the source of proper voltage. The instrument is to
be used only with three-wire grounded outlets.
Power is applied to the 1880 by pressing the red [POWER] button on the front panel.
On power-up the unit executes a number of self-tests. Refer to paragraph 3.3 for
description of the self-test messages.
At completion of the self-test routine the 1880 instrument is set for the following default
measurement conditions.
RANGE AUTO (Red light on)
TRIGGER INT. (Internal with red light on)
DISPLAY VALUE
SPEED SLOW (2.5 measurements/sec)
LIMIT SET ENABLE off (Red light off)
Since the instrument defaults to internal trigger at power-up repetitive measurements will
be indicated.
2.2 Instrument Zeroing
The 1880 Milliohmmeter provides automatic zeroing of test lead or fixture errors. During
the zeroing process a correction is stored in instrument memory and applied to ongoing
measurements. It is recommended that the unit be zeroed after power-up and any time the
test leads, range or fixture are changed.
The 1880 instrument is supplied with a 2-wire, 4-terminal Kelvin connection cable set
(1880-50) which plugs directly into the TEST connector on the front panel of the
instrument. This cable also has a guard clip for connection to a device where additional
shielding is necessary.
Operation Page 15 of 28
Proceed as follows for automatic zeroing:
Plug the cable set (or other lead set/fixture) into the front panel TEST connector.
Short the two clips of the 1880 test leads (or other lead set/fixture) together. The P+,
P- should be shorted directly together and I+, I- shorted together. When using the
1880 Cable Set, Figure 2-1 shows how the leads should be positioned to accomplish
this, i.e. the clips should be symmetrically positioned with the incoming cables on the
same side.
P-
P+
Cable Cable
I-
RedBlack
I+
Right Way
Cable
Cable
P- I+
Black
I-
Red
P+
Wrong Way
Figure 2-1: Test Lead Positioning for Zeroing
Keep hands clear of the shorted leads or fixture and press the [ ZERO] button on 1880
front panel. The zero correction is measured, stored and applied to all measurements
as long as the ZERO light (red) remains on.
If [ZERO] is turned off (red light out) this correction is lost and no longer applies.
NOTE
When ranging other than AUTO is chosen, zeroing should be performed on the selected
range to ensure measurement accuracy.
Page 16 of 28 Operation
2.3 Connection to Device Under Test
Figure 2-2 below shows a typical four-terminal Kelvin connection to the device under test
using the 1880 Test Lead Set that plugs into the front panel TEST connector.
P+
1880 Test Lead Clips 1880 Test Lead Clips
I+
DEVICE UNDER TEST
P-
I-
Figure 2-2: Device Under Test
Pin # Function
1 P+
2 I+
3 Guard
4 I-
5 P-
5
1
4
2
3
Figure 2-3: TEST Connector Configuration
2.4 Measurement Procedure
Once the instrument has been powered up, zeroed, and the device under test connected to
the instrument the measurement value will be displayed repetitively. Test conditions at
power-up default are discussed in paragraph 2-1. Test conditions can be changed by the
operator and are discussed in paragraphs 2-5 through 2-10.
Operation Page 17 of 28
2.5 Measurement Range Selection
For normal operation the 1880 RANGE should remain in AUTO (red light ON). This
will eliminate the potential for incorrect settings of the measurement range. In cases
where manual range selection is desired proceed as follows.
Press [RANGE UP] or [DOWN] button to set range manually (Auto red light
OFF). Pressing [UP] or [DOWN] exits AUTO ranging automatically.
[UP] or [ DOWN] button selects one of nine possible measurement ranges. The
units ranging from milliohms (m) to megaohms (M) are indicated below the
digital display. Refer to Table 2-1 below to determine the full-scale resistance
range.
Table 2-1: Measurement Ranges (Full Scale)
Full-Scale Range
Resolution
20m 200m 2 20 200 2k 20k 200k 2M
1u 10u 100u 1m 10m 100m 1 10 100
To return from a manual range setting to autoranging, press the [RANGE AUTO]
button (red light ON).
1880
MILLIOHMMETER
m
M
k
Figure 2-4: Display with Incorrect Range Setting
2.6 Trigger Selection
To initiate measurements on the 1880 instrument select the internal trigger (repetitive
measurements) or external trigger (single measurements). Internal trigger is the default
mode of the instrument at power-up. To change the TRIGGER proceed as follows:
Press [MAN/EXT] (red light ON) to select external triggering or single
measurement mode. Once selected a single measurement is made each time this
[MAN/EXT] button is pressed.
Press [INT] (red light ON) to return trigger to internal or continuous measurement
mode.
Page 18 of 28 Operation
2.7 Measurement Speed Selection
There are two user selectable measurement speeds available on the 1880, these being
FAST (5meas/sec) and SLOW (2.5meas/sec). Slow is the default mode of the instrument
at power-up. To change the speed proceed as follows:
Press [SPEED] to select either FAST (indicator lamp ON) or SLOW (indicator
lamp ON).
2.8 Display Selection
Results on the 1880 can be displayed as either measured Value, or % Deviation from a
user entered nominal value. Value display is the default mode of the instrument at
power-up. % Deviation display is only possible when LIMIT SET has been enabled i.e.
nominal value and % limits entered. To change the display proceed as follows:
Press [DISPLAY] to select either VALUE (indicator lamp ON) or % (indicator
lamp ON). LIMIT SET must be enabled to select a display of %. Refer to
paragraph 2.9 for setting a nominal value and limits.
2.9 Limit Setting
2.9.1 General
The limits are set using the thumb-wheel switch labeled NOMINAL VALUE and the two
thumb-wheel switches labeled LOW LIMIT (-)% and HIGH LIMIT (+)%. In all cases the
thumb-wheel digits are incremented up by pushing the button below the digit and
incremented down by pushing the button above the digit.
2.9.2 Setting Nominal Value
The nominal value is set using the NOMINAL VALUE thumb-wheel switch. It is
important to note that the position of the five digits on the switch correspond to the five
digits as shown on the display for the measurement range currently set.
Set the desired nominal value by pressing the push-button above or below the
digit to be changed. For example: If the range is currently selected as XX.XXX
m (auto or manual) a nominal value of 10000 must be entered for 10m.
Operation Page 19 of 28
2.9.3 Setting %
The low and high limits (from entered nominal) are set using individual thumb-wheel
switches. The limits must be entered in % only using three digits each.
A limit can be
entered to 1/10% i.e. an entry of 105 would be 10.5%. Note that the decimal point is
shown on the panel below each thumb-wheel switch.
Set the % deviation from nominal by pressing the push-button above or below the
digit to be changed. For example: A limit of 10% above and below nominal
would be entered as 100 for both low and high limits.
2.9.4 Enabling Pass/Fail Limits
Enabling the LIMIT SET will result in pass/fail lights and alarm activated to indicate
results of the measurement. The FAIL LO lamp lights if the measured value is below the
% of nominal entered for a low limit. The FAIL HI lamp lights if the measured value is
above the % of nominal entered for a high limit. The PASS lamp lights when the
measured value is between the two limits. The status of the audible pass/fail alarm is
dependent on the rear panel setting, i.e. it can be set to sound on a pass or a fail (refer to
paragraph 2.10).
To enable the limit comparator, press the [ENABLE] button (red light ON). It is
important to note that when the limit comparator is enabled the measurement
range is locked into the one currently selected. Also, when [ENABLE] is selected
the display automatically changes to show %, positive or negative with respect to
the nominal.
Value rather than % can be selected with the [DISPLAY] button.
2.10 PASS/FAIL Alarm Setting
By means of a rear panel switch the audible alarm can be made to sound on pass or fail,
based on results of the LIMIT SET. To change the alarm volume, rotate the silver rotary
switch clockwise to increase volume or counter clockwise to decrease volume.
To sound the alarm based on pass set the ALARM SIGNAL switch to PASS or good.
The alarm will sound when the LIMIT SET PASS lamp lights.
To sound the alarm based on fail set the ALARM SIGNAL switch to FAIL or no
good. The alarm will sound if either the LIMIT SET FAIL LO or FAIL HI lamp
lights.
Page 20 of 28 Operation
2.11 Input/Output Interface
(
)
2.11.1 Handler Interface
The 1880 instrument includes as standard a handler interface port for connection to a
component sorter. Connection is via a 9-pin DB9 connector located on the rear panel.
Refer to Table 2-2 for pin numbers and functional description.
Table 2-2: Handler Interface Functions
Pin # Name Description
1 FAIL-LO Measured value is lower than LOW LIMIT
2 FAIL-HI Measured value is higher than HIGH LIMIT
3 PASS Measured value within limits
4 EOT End of Test
5 EXT. TRIG External Trigger Input (low level)
6 +5 VCC +5 Volt DC supply (500mA, I
MAX
)
7 - No connection
8 - No connection
9 GND Ground
NOTE
Pull-up resistor of approximately 10k (to +5V, pin 6) may be necessary if not present on
controlling device.
15
69
Figure 2-5: Handler Interface Connector (rear panel)
Start Test
EXT TRIG
Measure
EOT
FAIL-HI, FAIL-LO FAIL-HI, FAIL-LO
Time
or PASSor PASS
dependent on measured result
Figure 2-6: Handler Interface Timing Diagram
Operation Page 21 of 28
2.11.2 IEEE-488 Interface Option
The IEEE-488 interface is available as an option to the 1880. When this option is present
connection is made through a connector (24 pin) on the rear panel. This interface can be
used to connect to a system containing a number of instruments and a controller which
meets the IEEE-488 Standard.
The following functions have been implemented. Refer to the standard for an explanation
of the function subsets, represented by the identifications below.
SH1 Source Handshake PP0 Parallel Poll
AH1 Acceptor Handshake DC1 Device Clear
T8 Talker DT0 Device Trigger
L4 Listener C0 Controller
SR0 Service Request E1 Electrical Interface
RL2 Remote Local
2.11.3 IEEE-488 Address Setting
Make sure the instrument power is turned off before setting the switches on the
instrument to the desired address. Refer to Figure 2-7 below. If the IEEE address is
changed after the instrument is powered up, the new address is recognized only after
another power up. Figure 2-7 shows the IEEE address set for 3.
IEEE 488 INTERFACE ADDRESS
13
1
14352786
ON
12
24
Figure 2-7: Rear Panel IEEE Addressing, Set for Address = 3
Page 22 of 28 Operation
2.11.4 IEEE-488 Commands
Device commands are used to tell the 1880 how to set up and when to make a
measurement. The device commands must be sent over the IEEE bus from the controller
when the 1880 unit is addressed as a listener. The device commands are listed in Table 23 below and must be entered using upper-case letters only. Device commands are
comprised into three groups, Range, Set and Start.
The Range command duplicates the front panel range functions. R0 turns auto
ranging on and RF turns it off. Any range can be selected to hold by commands R1
through R9, which automatically turns auto ranging off. The 1880 unit defaults to
auto ranging (R0) on power-up or on any device clear command (DCL).
The Set commands duplicate front panel test conditions listed below. The instrument
defaults to slow (S0), comparator off (S3), display value (S4), internal trigger (S6) on
power-up or device clear.
The Start command duplicates the function of the front panel trigger button.
Table 2-3: Device Commands
Type Command Function
RANGE
SET
R0: Auto range resistance (default)
R1:
R2:
R3:
R4:
R5:
R6:
R7:
R8:
R9:
Range 1: 20m F.S.
Range 2: 200m F.S.
Range 3: 2 F.S.
Range 4: 20 F.S.
Range 5: 200 F.S.
Range 6: 2k F.S.
Range 7: 20k F.S.
Range 8: 200k F.S.
Range 9: 2M F.S.
S0: Slow Measure Speed
S1: Fast Measure Speed
S2: Comparator ON
S3: Comparator OFF
S4: Display Resistance Value
S5: Display % Deviation
S6: Internal Trigger Mode
S7: External Trigger Mode
S8: Zeroing Function ON
S9: Zeroing Function OFF
START
G: Start Trigger
Operation Page 23 of 28
2.11.5 Output Data Format
Output data is in floating point format as illustrated in Table 2-4 below. A data string is
preceded by R if display is resistance value and P if display is % deviation.
NOTE
A negative value is possible on the lowest range or ranges when test lead zeroing is
enabled.
Table 2-4: Output Data Format
Range Measurement Results
(Resistance)
R1
R2
R3
R4
R5
R6
R7
R8
R9
R = - - . - - - m R = 999999 m
R = - - - . - - m R = 999999 m
R = - . - - - - R = 999999
R = - - . - - - R = 999999
R = - - - . - - R = 999999
R = - . - - - - k R = 999999 k
R = - - . - - - k R = 999999 k
R = - - - . - - k R = 999999 k
R = - . - - - - M R = 999999 M
R Value (Resistance)
Over Indication
Range Measurement Results
(%)
% Deviation
Over Indication
R1 P = - - - . - - % P = 999999 %
R2 P = - - - . - - % P = 999999 %
R3 P = - - - . - - % P = 999999 %
R4 P = - - - . - - % P = 999999 %
R5 P = - - - . - - % P = 999999 %
R6 P = - - - . - - % P = 999999 %
R7 P = - - - . - - % P = 999999 %
R8 P = - - - . - - % P = 999999 %
R9 P = - - - . - - % P = 999999 %
Page 24 of 28 Operation
2.11.6 Sample Program for IEEE-488
260 '******** INITIALIZE 1880 **********************
270 ADAP$="GPIB0" : DEV3$="Dev3" : R$ = SPACE$(16)
280 CALL IBFIND (DEV3$,DEV3%)
290 CLS '**** MEASURE AND DISPLAY DATA *************
300 SET$="S1:": CALL IBWRT (DEV3%,SET$) 'Fast
310 SET$="S3:": CALL IBWRT (DEV3%,SET$) 'Comp. Off
320 SET$="S4:": CALL IBWRT (DEV3%,SET$) 'Display R
330 SET$="S7:": CALL IBWRT (DEV3%,SET$) 'Ext. Trig.
340 SET$="R2:": CALL IBWRT (DEV3%,SET$) 'Hold Range
350 SET$="G:" : CALL IBWRT (DEV3%,SET$) 'Measure
360 FOR I = 1 TO 1000 : NEXT I 'Delay First Reading
370 CALL IBRD (DEV3%,R$): PRINT R$;
380 FOR I = 1 TO 8
390 SET$ = "G:" : CALL IBWRT (DEV3%,SET$)
400 CALL IBRD (DEV3%,R$)
410 PRINT I;" ";R$;
420 NEXT I
430 END
2.12 Operation with 1880-52 Test Fixture & Cable
The 1880-52 Test Fixture & Cable provides a method of convenient, reliable, guarded 4terminal connection of radial and axial leaded components to the 1880 instrument. The
1880-52 consists of the test fixture, three-foot cable for connection to the 1880 front
panel and two axial lead adapters.
Connection to 1880:
Connect one end (5-pin connector) of the 3-foot cable to the 1880 front panel TEST
connector.
Connect the other end of the cable (4-BNC connectors) to the fixture as shown in
Figure 2-8. Observe cable and fixture markings.
Operation Page 25 of 28
1880-52
I-
I-
P-
P+
I+
4-BNC to Axial/Radial Adaptor
P-
P+
I+
Figure 2-8: Fixture & Cable Connection
If the device under test (DUT) is a radial lead component it can be inserted directly into
the fixture slots. The slots accommodate wires with diameters from 0.25mm to 1mm
(AWG 30 to AWG 18 wire). If the DUT is an axial-lead component the two axial lead
adapters should be installed in the fixture (by pushing vertically downward) and the
component installed in them. These adapters accommodate wire with diameters up to
1.5mm (AWG 15 wire).
Instrument zeroing should be performed once the test fixture is connected. For
information refer to paragraph 2.2 on Instrument Zeroing. The fixture contacts should be
shorted with bus wire, the larger the better, but in accordance with wire sizes discussed
above. It should be noted that if measurements are to be made on the very lowest range
(20m full-scale), readings could be in error, although small, by the resistance value of
the short itself. The approximate value of the shorting wire can be determined by zeroing
the instrument using the standard 4-terminal Kelvin clips and then measuring the
resistance of the shorting wire.
Page 26 of 28 Operation
Section 3: Service & Calibration
3.1 General
Our warranty (at the front of the manual) attests the quality of materials and workmanship
in our products. If malfunction should be suspected, or other information desired,
applications engineers are available for technical assistance. Application assistance is
available in the U.S. by calling 978-461-2100 and asking for Applications Support. For
support outside of the United States please contact your local QuadTech Distributor.
3.2 Instrument Return
Before returning an instrument to QuadTech for service please call our Customer Care
Center (CCC) at 800-253-1230 for return material authorization (RMA). It will be
necessary to include a Purchase Order Number to insure expedient processing, although
units found to be in warranty will be repaired at no-charge. For any questions on repair
costs or shipment instructions please contact our CCC Department at the above number.
To safeguard an instrument during storage and shipping please use packaging that is
adequate to protect it from damage, i.e., equivalent to the original packaging and mark the
box "Delicate Electronic Instrument". Return material should be sent freight prepaid to:
QuadTech, Inc.
5 Clock Tower Place, 210 East
Maynard, MA 01754
Attention: RMA #
Shipments sent collect can not be accepted.
Service & Calibration Page 27 of 28
3.3 Error Messages
The following messages/error messages are possible on the instrument display.
Message
Description
"UUUUU" Measurement over-range
"00-00" Internal RAM read/write error, initialize instrument with power-up.
Service may be required.
"11-11" CALIBRATION switch on rear panel may be ON.
"22-22" Internal EEPROM read/write error, initialize instrument with power-up.
Service may be required.
"33-33" A/D converter failure, service required.
"C-LON" Zero calibration lost for range N, re calibration required for this range.
"C-HIN" High value calibration lost for range N, re calibration required for this
range.
"ERROR" Incorrect standard resistor being used for calibration.
"1880" Instrument model number, displayed at power-up.
Page 28 of 28 Service & Calibration
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