Troubleshooting guide

Monark 831 E
16
Calibration
The 831 E is a mechanically weighted and braked
ergometer, making performance validation a simple
procedure. The work performed on the ergometer is
the product of the weight lifted times the numbers
of revolutions (factored). Validation includes both
mechanical and electronic procedures. If the ergometer
fails to pass any section of the validation, proceed to
the calibration and/or service menu (‘99’ in the main
menu).
Inspection of all mechanical components is suggested
after any repair, or component service. The following
validation should be performed annually:
Remove the cover from the flywheel.1.
Loosen the brake belt at the balancing spring.2.
Wait until the flywheel is no longer moving.3.
The pendulum weight index should be aligned 4.
with “0“ on the scale.
Connect the calibration weight to the point at 5.
which the spring was attached.
The known weight should match the value on the 6.
scale. If not see section “Calibration of Pendulum
Weight “.
Reattach the brake belt.7.
Reassemble the cover.8.
Proceed to the validation to complete.
Validation
The following procedure will assure the user that the
ergometer is performing properly on a daily basis. The
test exercises the mechanical braking, rpm and speed
detecting systems, as well as the computer regulation
and sensing capability of the mechanical system.
Additionally, if a calibrated ECG simulator is available,
it may be used to verify the heart rate measuring
system. Whether the simulator is used or not, the heart
rate system may be validated by simply taking a pulse
point rate measurement at the neck for example. While
a patient is at rest and has been prepared for chestbelt
electrodes or an ear sensor, the pulse indicator flashes
once per pulse beat. The displayed rate, should agree
with the manually detected pulse rate. If not, check
the patient electrode connection and skin preparation
prior to requesting service.
Validation of force
From main menu go to any start display with Newtons
(N).
With the pendulum at zero, the display should 1.
read “00N“.
Move the pendulum weight to the 4 kp position 2.
and the display should read “39N“.
Decrease the position of the weight by steps of 1 kp. 3.
The display should read correctly at all positions.
NOTE!
The brake belt will become loose and because of this
it will take a few seconds before normal workload is
obtained the first time the ergometer is used.