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The signal and pin numbers for J1, the RS-232C Interface connector, are shown in table 1-6.
The MP4 can understand the eight-bit binary-coded messages shown in table 1-7.
Binary Code
196
197
212
The MP4 includes a 4-foot long RS-232 extension cable, with DB25 male connectors, used to connect
the MP4 to either a serial printer or the RS-232C serial port of a computer.
Calibration Weights
A set of uncertified calibration weights is supplied with the MP4. When used carefully, with the weight
hanger supplied, they provide an effective method of re-calibration. The weights supplied with the MP4
are: 1, 2, 5, 10, 20, 50 and 100 grams. A weight hanger and a 300 and a 500 gram weight are supplied
with the 1000gf beam. The weight rack, which is supplied, provides a convenient method for storing the
weights. These uncertified weights are within 1/4% of the weight indicated.
Standard Device Holder
The Model DHF device holder, included with each MP4, is designed for flat substrates which range
from 1/4 to 2 inches square. The base of the device holder is spring loaded so that it can be manually
depressed up to 1/4 inch. This feature allows easy removal of the hook from deep packages. The
overall size of this device holder is 3 inches (7.6 cm) diameter by 2.375 inches (6 cm) high.
In additional to the standard device holder, the following optional device holders may be ordered:
a
Model DHD device holder, with spring-loaded base, is designed for 0.3 to 0.6 inch wide side-brazed
or 0.250 inch wide CERDIP packages with lengths up to 2.070 inch.
b Model DHL device holder is designed for lead frames which have eight to 40 leads.
Optics
An optional stereo zoom optic may also be ordered. The unit has 0.7 – 3x magnification, with 20x
eyepiece and a 0.5 object lens. The optic includes the arm and porthole assembly.
990-180
Table 1-6. RS-232 Interface Connector, J1, Signals
Pin
2
3
7
Table 1-7. Message Codes Understood by MP4
Disables the footswitch. Colon will light.
Enables the footswitch. Colon will go out.
Current Peak Force reading and message will be transmitted.
®
MICROPULL
IV WIRE BOND PULL TESTER
CHAPTER 1: SYSTEM DESCRIPTION
Description
Received data
Transmitted data
Signal ground
Response by MP4
1-9
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