Mahr 25 ES, Operating Instructions Manual

Setting and measuring functions

(Please open page 24 for illustrations)

Putting into operation:

Switching-on
–  press key 2.3 (ON/OFF) for less than 2 sec.

Note: The display shows the last activated mode before switching-off.

Switching-off
–  press key 2.3 (ON/OFF) for more than 2 sec.

Note: Even after switching-off the last displayed value is memorized.Immediately after switching-on
measuring can commence providing that the position of the right measuring arm holder was not
changed.

Measuring function:

Changing of the measuring unit (mm/inch) (Fig. A)
–  press key 2.4 for less than 2 sec.

RESET (zeroing) (Fig. B)
–  press key 2.3 for less than 2 sec. The display shows either 0 or the last stored PRESET-value,
    depending on the active reference level.

Reference function:

Switching to reference mode (REF I/II) (Fig. C)
–  press key 2.4 for more than 2 sec.

Selecting reference mode (REFI/II)
–  press key 2.4  for less than 2 sec.

HOLD-mode (Fig. D)
–  press key 2.3 for less than 2 sec.
–  to cancel, press key 2.3 once more for less than 2 sec.

Note: The HOLD-function is only available in REF I or REF II. When the instrument is connected to a
peripheral unit (e.g. printer) via data exit 2.5., the stored value will be accepted.
A reset into the measuring function is not possible as long as "HOLD" is displayed.

PRESET- input function:

–  select REF I or II,
–  press key 2.4 until PRESET appears in the display (Fig. E)
–  using key 2.3 select counting direction
–  using key 2.4  select the position of the first digit
–  using key 2.3 set required value
–  continue with key 2.4 and key 2.3 until the required value is entered
–  finally for confirmation and return to the measuring function press key 2.4 for more than 2 sec.

12

Note: The instrument cannot be switched off while the PRESET-input function is active.

MIN/MAX- function:

Automatic storage and display of MIN and/or MAX as well as display of MIN-MAX (difference,
absolute).

– press key 2.4 for more than 2 sec. until MIN appears in the display (Fig. F)

Note: After release of the key 2.4 the last activated function MIN, MAX or MIN - MAX (difference,
absolute) appears. The register MIN and MAX are then refreshed with the actual value.

– to select the required function MIN, MAX or MIN - MAX subsequently press key 2.4 repeatedly for

less than 2 sec. until the required function is obtained.

Call-up of the MIN- and MAX- register:

– press key 2.4 for less than 2 sec

Tolerance function:

Exceeding the enterred high and low tolerance limit is indicated by arrows thus TOL 

▲

 resp.TOL 

▼

Entering the high tolerance limit:

– press key 2.4 for more than 2 sec. until TOL appears in the display (Fig. G)
– followed by pressing key 2.4 for less than 2 sec. to select the high tolerance limit input function
– enter the high tolerance limit in the same manner as enterring a PRESET- value (Fig. H)

Entering the low tolerance limit:

– press key 2.4 for more than 2 sec.
– enter the low tolerance limit in the same manner as enterring a PRESET- value

Return to the tolerance function:

– press key 2.4 for more than 2 sec. until SET disappears from the display

Changing the counting direction:

– simultaneously press key 2.3 and 2.4 for more than 2 sec. The display continually changes

   between 0000.01 and – 0000.01 (not possible in PRESET-function). As soon as the resolution
   with the required counting direction appears release both keys.

Use with OPTO-RS 232 -plug:

The adapter plug opto-RS 232 permits the remote control of all key functions of the instrument from a
computer (PC or SQS-system).

11