ITS Telecom P790 User manual

P790
Precision 2-channel hand-held
measuring instrument
Operating Instruction

1.
2.
4. 3.
5.
6.
7.
1. Mounting device for probe handle
2. Retractable stand
3. Measuring port 1
4. Measuring port 2
5. USB PC interface port
6. Keyboard
7. Big LC-Display

Summary
1. Handling
1.1. General advices
1.2. Setting to work
1.3. Switch on/off
1.4. Menu
1.4.1. Measuring unit switching (Unit)
1.4.2 Automatische Fühlererkennung (Smartprobes)
1.4.3 Probe selection / (Prob)
1.4.4 Difference temperature (L in2)
1.4.5 Calibration (CAL)
1.4.6 Channel activation (Chnl)
1.4.7 Memory setup (Lo6)
1.4.8 Bluetooth activation (bLE)
1.5. Recalling memory data (HOLD/MAX/MIN/AVG)
1.6. Measuring rate (FAST-Mode)
1.7 AUTO-OFF4unction
1.8. TARE-Function (ZERO-Mode F1)
2. Power supply / Changing the battery
3. Error codes / troubleshooting
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1. Handling
1.1 General advices
- For cleaning the instrument please do not use abrasive cleaner but a dry or
wet piece of cloth.
- Please store the measuring instrument in a dry and clean place.
- Avoid any force like shocks or pressure to the instrument.
- Do not use force to connect the probe or interface plugs in. The interface
plug is different from the probe plug.
- lf no sensor is connected to the instrument while switching on „open“
shows on the display (Please refer to chapter error codes / troubleshooting).
- A retractable stand on the back of the instrument allows it to be used as a
bench top instrument.
1.2 Operation
Before switching on the instrument, connect the probe/s to the instru ment and
insert the battery (Please refer to chapter 2. Power supply/changing the battery).
A number an the instrument‘s housing marks each port.
1.3 Switching on and off
By operating the ON/OFF-key the instrument switched on or off. After switching
on the instrument indicates a full segment test for 15 seconds, then it starts to
function in measurement mode indicating the actual measurement value.
1.4 Menu
The adjustments of the instruments function: measurement value, calibration
of probes, deactivation of channels, for example, are selected from the menu
structure. Enter into the main menu by push ing (ENTER/ MENUE). Use the up
and down keys ( ) to select the required menu. Push (ESC) to revert back
to the measuring mode.
1. (ESC) key
2. Up and down keys
3. (ENTER/MENUE) key
Menu structure
1.4.1 Measuring unit switching °C, °F and Resistance (Ohm‘s) (Unit)
Unit = Measuring unit
Measuring unit temperature (°C=Celsius, °F=Fahrenheit, o=Ohm)
To change the measuring unit push (ENTER/MENUE). Use the up and down
keys ( ) to select Unit. Push again (ENTER/MENUE). On the right corner
of the display appears °C, °F or o. Use the up and down keys ( ) again to
adjust the requested measuring unit and push (ENTER/MENUE) to confirm. Push
(ESC) to be back in the measuring mode.
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
1.4.3 Probe selection / (Prob)
In case of using probes of the instrument series (P700-P770) please select
probes according to the following description.
Push (ENTER/MENUE) to change a probe. Use the up and down keys ( ) to
select Prob. Push (ENTER/MENUE) to confirm.
On the left corner of the display appears a small 1, which indicates the selected
channel. For changing the channel use the up and down keys ( ). Push
again (ENTER/MENUE) to confirm. On the right corner of the display appears
the active probe. Use the up and down keys ( ) to change the probe. Push
(ENTER/MENUE) to confirm the requested probe. Push (ESC) to be back in the
measuring mode.
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
Unit
°C
°F
0
Prob
PT
J
K
L
N
R
S
T
RH
L in 2
T1-T2
CAL
CoFF
oP 1
oP 2
oP 3
oP 4
ChnI
oFF
on
Lo6
oFF
on
bLE
oFF
on
1.4.2 Automatische Fühlererkennung (Smartprobes)
The Instrument detect Smartprobes with Eprom automatically. It is not necessary
to select this probes by the menu function Prob! After switching on the displays
option CAL 4 (1 sensor with Eprom) or CAL 44 (2 sensors with Eprom).
1.
3.
2.

1.4.4 Temperature difference / (L in2)
To display the temperature difference push (ENTER/MENUE). Use the up and
down keys ( ) to select L in2. Push again (ENTER/MENUE). On the right
corner of the display appears a T1-T2. Use the up and down keys ( ) to
adjust the requested selection. Push (ENTER/MENUE) to confirm. Push (ESC)
to revert back to the measuring mode.
Note: Both channels have to be activated for displaying temperature difference.
Push (ENTER/MENUE) to confirm. Push (ESC) to revert back to the measuring
mode.
Note: Please check the probe selection to be sure that the correct probe is
entered. If a measurement value is changed with the ENTER-key at the menu
Prob, the standard calibration will be automatically used.
Indications for the combination probes (temperature and humidity):
Please adjust relatively humidity as measurement value for the channel on which
the combination probe is plugged. If you want that the measured temperature
of the plugged combination probe is shown as well, you have to deactivate the
channel on which no probe is plugged on (see chapter 1.4.6./Chnl)
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
1.4.5 Calibration function / (CAL)
Despite high quality manufacturing techniques, each probe is slightly different
from specified standards. To eliminate inaccuracies caused by exchanging or
ageing of probes, the instrument offer easy calibration functions which guarantee
that the system accura cy is always as good as if the instrument was specifically
calibrated to the individual probes in our laboratory.
The instruments offer ve different calibration options:
1) (CoFF): Standard characteristic curve
(e.g. Pt100-resistance according EN60751)
2) (oP 1): Calibration by code (2 x four digit code) is equivalent to a 2-point
calibration. The code is marked clearly by a label on each standard
probe.
3) (oP 2): Calibration by physical standard references
(1-point, 2-point or 3-point calibration)
4) (oP 3): Calibration according to Coefficients of EN60751 (RO, ABC)
5) (oP 4): Smart EEprom probes with internal calibration
CAL = calibration
Push (ENTER/MENUE) to calibrate the instrument with sensor. Use the up and
down keys ( ) to select CAL. Push again (ENTER/ MENUE). On the left
corner of the display appears a small 1, which indicates the selected channel. To
change the channel (1 or 2) use the up and down keys ( ). Push (ENTER/
MENUE) to confirm.
Use the up and down keys ( ) to select the requested calibration option.
Push (ENTER/MENUE) to confirm.
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
CoFF oP 1 oP 2 oP 3 oP 4
CAL
1) Standard calibration according to DIN EN60751 / (CoFF)
Use the up and down keys ( ) to select (CoFF). Push (ENTER/MENUE) to
confirm. Push (ESC) to revert back to the measuring mode.
2) CaIibrationby code / oP1
Use the up and down keys ( ) to select oP 1. Push (ENTER/ MENUE) to
confirm. On the bottom of the display appears a small 1, after this number a
four-digit number (Hex-Code/0..F) is dis played. For changing the number use the
up key ( ). To step to the next number use the down key ( ). lf the requested
number is complete then push (ENTER/MENUE) to confirm. At the bottom of the
display a very small 2 appears, after which a second four-digit number is displayed.
For changing the number please follow the manual as before. Push (ESC) to
revert back to the measuring mode.
Note:
After confirmin oP 1 by pushing (ENTER/MENUE) the function oP 1 (calibration
by code) is activated, even though you leave the menu by pressing (ESC).
Display-indication with active calibration code (oP 1):
The CAL-segment and the small 1 indicates to the user
that oP 1 is activated.
Measurement Probe selection LC-Display Suitable for these types
(Prob) of measuring instruments:
...............................................................................................................................
Temperature Pt100 (RTD) P700/P705/P750/P755/
P770/P755-LOG/P770-LOG
...............................................................................................................................
Temperature Fe-CuNi Typ J for all P700-instruments
...............................................................................................................................
Temperature NiCr-Ni Typ K for all P700-instruments
...............................................................................................................................
Temperature Fe-CuNi Typ L for all P700-instruments
...............................................................................................................................
Temperature NiCrSi-NiSi Typ N for all P700-instruments
...............................................................................................................................
Temperature Pt13Rh-Pt Typ R P700/P705/P750/P755/
P770/P755-LOG/P770-LOG
...............................................................................................................................
Temperature Pt10Rh-Pt Typ S P700/P705/P750/P755/
P770/P755-LOG/P770-LOG
...............................................................................................................................
Temperature Cu-CuNi Typ T for all P700-instruments
...............................................................................................................................
Humidity %rF P700/P705/P750/P755/
P770/P755-LOG/P770-LOG
...............................................................................................................................

3) Calibration by physical standard references / oP 2
Use the up and down keys ( ) to select oP 2. Push (ENTER/MENUE) to
confirm. On the bottom of the display appears 1 P. For changing between a
1-Point (1 P), 2-Point (2 P) or 3-Point (3 P) - cali bration use the up and down
keys ( ).
1 P 2 P 3 P
oP 2
Example of a 1-Point calibration:
Push (ENTER/MENUE) to confirm. On the display appears CALC. After the
displayed measuring value is stabile push (ENTER/ MENUE). On the first
display line you can see the „frozen“ measure ment value. On the second
line as a default you can see -100.000. Now you have to enter (instead
of -100.000) the correct measure ment value from your reference:
By using the up key ( ) you are able to move the decimal point to
setup the number of decimal places. Push (ENTER/MENUE) to con firm
Now the algebraic sign is blinking „-“. Use the up key ( ) to toggle for positive
or negative number. Change the number using the up and down keys ( ):
( ) is changing the blinking segment
( ) is jumping to the next segment
Push (ENTER/MENUE) to confirm, revert back to the measuring mode.
lmportant:
To abort the physical calibration use the (ESC)-button.
Display-indication with active calibration code (oP 2):
The CAL-segment and the small 2 indicates to the user
that oP 2 is activated.
4) Calibration according to Coefcients of EN60751 (R0, ABC)/ oP 3
By using Option 3 you are able to activate coefficients according to EN60751
(RO, A, B, C). The coefficients have to be calculated using special software on
a PC (e. g. P7_CALC). Before you are able to activate this option you have to
transmit the coefficients from the PC to the instrument. Therefore you have to use
the Soft ware P7 _CALC, too.
Use the up and down keys ( ) to select oP 3. Push (ENTER/MENUE) to
confirm. Now the calibration option 3 is activated! Push (ESC) to revert back to
the measuring mode.
Note: After confirmin oP 3 by pushing (ENTER/MENUE) the function oP 3
(calibration by code) is activated, even though you leave the menu by pressing
(ESC).
Display-indication with active calibration code (oP 3):
The CAL-segment and the small 3 indicates to the user
that oP 3 is activated.
5) Smart EEprom-probes with internal calibration (AUTO-Detection) / oP 4
The Option 4 will be activated automatically by using Smart EEprom probes. This
option will be activated by switching on the instrument when the Smart EEprom
probe has been connected to the instrument.
Display-indication with active calibration code (oP 4):
The CAL-segment and the small 4 indicates to the user
that oP 4 is activated.
Note:
lf a Smart probe will be disconnected during the instrument is work ing the
instrument automatically switch to the CAL-menu.
1.4.6 Channel activation (only 2-channel instruments) / (Chnl)
Chnl = Channel
To activate or deactivate a measuring channel push (ENTER/MENUE). Use the
up and down keys ( ) to select Chnl. Push again (ENTER/MENUE). On
the left corner of the display appears a small 1, which indicates the selected
channel. To change the channel use the up and down keys ( ). Push
(ENTER/MENUE) to confirm. Use the up and down keys ( ) again to
activate on or deactivate off the requested measuring channel and push (ENTER/
MENUE) to confirm. Push (ESC) to revert back to the measuring mode
Note: As a minimum one channel is active!
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
1.4.7 Memory Setup Lo6
Push (ENTER/MENUE) and use the up and down keys ( ) to select Lo6.
Push (ENTER/MENUE) to confirm. Use the up and down keys ( ) again
to start (on) or Stop (off) the logger. Push (ENTER/MENUE) to confirm. Use the
up and down keys ( ) again to select between automatic storage (Auto)
or manually operated storage (SPot). Push (ENTER/MENUE) to confirm. Use
the up and down keys ( ) again to select between to add on data (Add)
and creating a new file (nLo6). Push (ENTER/MENUE) to confirm. By selected
automatic storage at the end you have to select the time interval:
1 S 1 second
5 S 5 second
10 S 10 second
20 S 20 second
30 S 30 second
1 M 1 minutes
2 M 2 minutes
5 M 5 minutes
10 M 10 minutes
20 M 20 minutes
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
E.g. of the instrument’s LCD by activated logging mode:
On the bottom you can see the percentage of the
occupied memory (0..99%). If a calibration option is
activated the display is alternating between displaying
memory status and calibration information.

1.4.8 Bluetooth activation/deactivate / (bLE)
bLE = Bluetooth = off / on
To activate or deactivate bluetooth push (ENTER/MENUE). Use the up and
down keys ( ) to select bLE. Push again (ENTER/MENUE). Use the up key
() to activate on or deactivate off the bluetooth function and push (ENTER/
MENUE) to confirm. Push (ESC) to revert back to the measuring mode.
Unit Prob L in 2 CAL ChnI Lo6 bLE
MENUE
1.5 Recalling the memory data (HOLD MAX MIN AVE)
After pushing first time the key (HOLD MAX MIN AVE) the actual values will be
held on the display. Pushing again the key (HOLD MAX MIN AVE), the saved
maximum-, minimum and average values will be displayed.
Note: During the recall of the memory data the extremes (MAX MIN) and the
average value (AVE) will not be calculated or carried on.
Clearing the memory (MAX MIN AVE)
Press (CLEAR) key once to erase the stored maximum, minimum and average
from memory. On the display appears Clr. – After erasing the memory the
instrument automatically reverts back to measuring mode indicating the actual
measured value again.
1.6 Measuring rate (Normal-Mode / FAST-Mode / Filter-Mode)
The instrument has three different response times to select:
Normal-Mode: high resolution
(0.001 from -199.999 to +199.999)
FAST-Mode: reduced resolution
(0.01 from -199.99 to +199.99)
Filter-Mode: high resolution
(0.001 from -199.999 to +199.999)
Press (FAST / ) key to change the measuring rate. By using the Filter-
Mode the instrument is performing a moving average to stabilize the dispayed
measurements. After turning on the instrument it is in the Normal-Mode. After
pressing once the (FAST / ) key the instrument switches to the Fast-Mode.
Pressing the same key once again the instrument switches to the Filter-Mode.
E.g. Display with activated Filter-Mode:
The arrow on the top indicates that the instrument is
working in the Filter-Mode.
Note: After switching off the instrument, this function is automatically deactivated.
1.7 AUTO-OFF-function
dAoF = Disable Auto-off
EAoF = Enable Auto-off
Press (ESC/AUTO-OFF) key once. On the display appears EAoF. Now the
instrument switches off automatically after app. 30 minutes. Press (ESC/AU-
TO-OFF) key again. On the display appears dAoF. Now the Auto-Off-function
is deactivated.
Attention: This setting will be deactivated when the instrument turns off.
(Standard setting is EAoF).
1.8 TARE-Function (ZERO-Mode F1)
The Instrument has a special Tare/Zero-button. Pressing the (F1) key once, the
instrument will subtract the last measured value from the actual measured value.
So if the measurement does not change zero appears on the instrument’s display.
If you press the (F1) key once again the instrument move to the Normal-Mode.
E.g. Display with activated Zero-Mode:
The arrow on the left indicates that the instrument is
working in the Zero-Mode (F1).
Note: After switching off the instrument, this function is automatically deactivated.
2. Power supply
- For the power supply of the instrument a 9 Volt dry battery is used.
To exchange the battery switch of the instrument and open the rear battery
cover. Remove the battery from the instrument and replace with a new battery.
- The “BAT” symbol in the display indicates that the battery needs to be
exchanged. After displaying the “BAT” symbol, the instrument allows
app. 1 hour of further operation.
- The battery symbol indicates according to the battery status between
1 to 3 segments.
Attention:
Please do not dispose of old electronic devices and empty batteries in household
waste. To protect the environment, take them to your retail store or to appropriate
collection sites according to national or local regulations.

3. Error Codes
By displaying the following error codes the instrument support the operation of
the instrument:
Error Meaning
oPEn no probe or wrong probe is connected
„too low“ underflow of the measuring rang
„too high“ exceeding of the measuring range
E15 low battery (battery is completely exhausted)
E19 low battery (battery is completely exhausted)
E1d low battery (battery is completely exhausted)
E16 time out / auto-off-function (Switch device on again)
E1e time out / auto-off-function (Switch device on again)
E23 RAM content destroyed (check settings)
E25 EE-prom destroyed or EE-prom index is wrong
E31 Interface error
LoLi internal buffer battery (CR2032) empty
(for changing the battery the housing must be unscrewed)
Hinweis:
Hint: Defective or empty batteries can cause measurement errors or error
messages. On error messages, remove battery and wait 3 minutes prior to
mounting a new battery.