194 TPI (Test Products Int), 194 Datasheet - Page 17

• Manufacturer Part Number: 194
• Description: DMM AUTO-RANGE IND 600V CAT IV
• Manufacturer: TPI (Test Products Int)
• Series: 190r
• Type: Digital (DMM)r

Specifications of 194

• Includes: Battery, Test Leads
• Style: Handheld
• Display Digits: 4.75
• Display Type: LCD, Bar Graph
• Display Count: 50000
• Function: Voltage, Current, Resistance, Capacitance, Frequency
• Functions, Extra: Continuity, Diode Test
• Features: Auto Off, Backlight, Hold, Min/Max, RS-232 Port, Sleep
• Ranging: Auto/Manual
• Response: True RMS
• Lead Free Status / RoHS Status: Vendor undefined / Vendor undefined
• Other names: 194TPI; 194TPI; 290-1424; TPI 194; TPI194

31
m. Relative % Mode
n. Two-Hold System
The Relative % mode takes the actual reading on the main
display and compares it to a reference value programmed by
the user on the right hand sub-display. The left hand sub-
display will show the percentage the actual reading varies
from the reference value. Activate the function as follows:
1. To use
2. Depress the
3. Depress the
4. Depress
5. Depress the
6. Repeat steps 4 and 5 until correct values for all four digits
7. After the correct
8. Measure the circuit or component being compared to the
9. Depress the
The two-hold system is a data hold feature that will
automatically store a stable reading under the 1 HOLD sub-
display in the lower left hand corner of the LCD. When a
new, stable reading is obtained, the reading under 1 HOLD
will be moved to 2 HOLD and the new reading will be
displayed under 1 HOLD
Depress the
Push the button again to de-activate the feature.
programmed reference value. Results will be displayed as
a percentage in the lower left hand left hand sub-display.
the function.
REF
selected for that display position.
above will start to flash.
under
button.
the function.
sub-display will start to flash.
REF
Relative
REL
HOLD
sub-display are entered.
REL
EDIT
REC
REL
% or
REF
% button.
% button or turn the rotary switch to exit
button to activate the feature.
% mode manually select the range for
button. The next digit to the right of 3
button. The right hand digit under the
HOLD
value is entered, depress the
buttons until correct number is
EDIT
2. Transmitte format(DMM to PC)
1. Specification
o. RS-232C interface
“fun b sign value b unit b cr lf”
Demonstration software is provided with the DMM. The
program is written for windows using MFC. For you own
applications, consult the following;
Baud rate
Parity
Data length
Stop bit
Output and Input of all data are ASCII String.
Send Format( DMM to PC )
fun
b
Sign
Value
unit
cr
lf
Function code
Ohm/Continuity
Inductance
Function
Capacitance
Frequency
Adaptor
DCmV
Diode
DCV
ACV
mA
uA
A
19200 baud
none
8 bit
1 bit
Function(ASCII code)
blank(0x20)
-(0x2E)/ (0x20)
Measured value(ASCII string)
Unit(ASCII string)
Carriage Return
Line Feed
AC/DC1,2,3 TMP
Function code
OHM/BEP
DCA/ACA
DCA/ACA
DCA/ACA
DCV
DCV
ACV
CAP
FRQ
DIO
IND
Ohm/ Kohm/ Mohm
A/ tC/ tF
Hz/ Khz
uF/mF
Unit
mH
mV
mA
uA
V
V
V
A
32