Precision Measuring Instrument
P795
English language
Operating manual
P795_englisch_V010608.doc
DOSTMANN electronic
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. Difference temperature (Lin2)
1.4.3. Calibration (CAL)
1.4.4. Channel activation (Chnl)
1.4.5. Memory setup (Lo6)
1.5. Recalling memory data (HOLD/MAX/MIN/AVG)
1.6. Measuring rate (FAST-modus)
1.7. AUTO-OFF-function
1.8. TARE-Function (ZERO-Mode F1)
2. Power supply / Changing the battery
3. Error codes / troubleshooting
1. Handling
1.1 General advice
- 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.
- If 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 instrument and insert
the battery (Please refer to chapter 2. Power supply/changing the battery). A number
on 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
pushing [ENTER/MENUE]. Use the up and down keys []
to select the required menu. Push [ESC] to revert back to the
measuring mode.
Up and down keys
key [ESC]
key [ENTER/MENUE]
Menu structure
Unit Lin2 CAL Chnl Lo6
°C T1-T2 OFF OFF OFF
°F OP1 ON ON
Ohm OP2
OP3
OP4
1.4.1 Measuring unit switching °C, °F and Resistance (Ohm’s)
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.
MENUE
Unit Lin2 CAL Chnl Log
1.4.2 Temperature difference (only 2-channel instruments) / [Lin2]
To display the temperature difference push [ENTER/MENUE]. Use the up and down
keys [] to select Lin2. 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.
MENUE
Unit Lin2 CAL Chnl Log
Note: Both channels have to be activated for displaying temperature difference.
5.4.4 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 accuracy is always as good as if the instrument was specifically calibrated to
the individual probes in our laboratory.
The instruments offer five different calibration options:
1) [OFF]:Standard characteristic curve (e.g. Pt100-resistance according EN 60751)
2) [OP1]: 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) [OP2]:Calibration by physical standard references (1-point, 2-point or 3-point
calibration)
4) [OP3]: Calibration according to Coefficients of EN60751(R0,ABC)
5) [OP4]: Smart EEprom probes with internal calibration(AUTO-Detection)
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 use the up and down keys []. Push [ENTER/MENUE] to confirm
MENUE
Unit Lin2 CAL Chnl Log
Use the up and down keys [] to select the requested calibration option. Push
[ENTER/MENUE] to confirm.
CAL
oFF oP1 oP2 oP3 oP4
1.) Standard calibration according DIN IEC 60751 / [oFF
Use the up and down keys [] to select [oFF. Push [ENTER/MENUE] to confirm.
Push [ESC] to revert back to the measuring mode.
2-) Calibration by code / oP1
Use the up and down keys [] to select oP1. 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 displayed. For changing the number use the up key []. To step
to the next number use the down key []. If 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 confirming oP1 by pushing [ENTER/MENUE] the function oP1
(calibration by code) is activated, even though you leave the menu by pressing
[ESC].
Display-indication with active calibration code(OP1):
The CAL-segment and the small 1 indicates to the user that
oP1 is activated.
3.) Calibration by physical standard references / oP2
Use the up and down keys [] to select oP2. Push [ENTER/MENUE] to confirm.
On the bottom of the display appears 1 P. For changing between a 1-Point 1 P, 2Point 2 P or 3-Point 3 P - calibration use the up and down keys [].
oP2
1 P 2 P 3 P
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” measurement value. On the second line as a default you
can see -100.000. Now you have to Enter (instead of -100.000) the correct
measurement 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 confirm.
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 [].
Note:
Up key is changing the blinking segment
Down key is jumping to the next segment
Push [ENTER/MENUE] to confirm, revert back to the measuring mode.
Important: A break of the physical calibration cannot be done by the [ESC]-button.
Display-indication with active calibration code (OP2):
The CAL-segment and the small 2 indicates to the user that
oP2 is activated.
4.) Calibration according to Coefficients of EN60751 (R0,ABC)
By using Option 3 you are able to activate coefficients according to EN60751
(R0,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 Software
P7_CALC, too.
Use the up and down keys [] to select oP3. Push [ENTER/MENUE] to confirm.
Now the calibration option 3 is activated!
Push [ESC] to revert back to the measuring mode.
Note: After confirming oP3 by pushing [ENTER/MENUE] the function oP3
(calibration by code) is activated, even though you leave the menu by pressing
[ESC].
Display-indication with active calibration code (OP3):
The CAL-segment and the small 3 indicates to the user that
oP3 is activated.
5) Smart EEprom-probes with internal calibration (AUTO-Detection)/ oP4
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.
The CAL-segment and the small 4 indicates to the user that
oP4 is activated.
Note: If a Smart probe will be disconnected during the instrument is working the
instrument automatically switch to the CAL-menu.
1.4.4 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!
MENUE
Unit Lin2 CAL Chnl Log
1.4.5 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 seconds
10 S 10 seconds
20 S 20 seconds
30 S 30 seconds
1 M 1 minute
2 M 2 minutes
5 M 5 minutes
10 M 10 minutes
20 M 20 minutes
By selected manually operated storage you are able to save the measurement by
pressing ESC by each time.
Push [ENTER/MENUE] to confirm. Push [ESC] to revert back to the measuring
mode.
MENUE
Unit Lin2 CAL Chnl Log
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.
1.5 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
EAoF = Enable Auto-off
dAoF = Disable 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/AUTO-OFF]
key again. On the display appears dAoF. Now the Auto-Off-function is deactivated.
Note: After switching off the instrument, this function is automatically deactivated.
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.
Note: For protection of our environment please don’t put the battery into general
household waste, but use a local authority approved disposal method.
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
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