Differences

This shows you the differences between two versions of the page.

--- chara:trouble_shooting [2023/07/06 07:40]
gail_stargazer
+++ chara:trouble_shooting [2023/07/06 07:45]
gail_stargazer
@@ Line 249: / Line 249: @@
   * This will install run_ople. Try opening the ople server again.
-==== Metrology and Homing carts ====
+==== Homing carts ====
-  * Good metrology signals are important to the proper positioning of the carts. Monitor the signal strength by running [RUN MULTIPLE] on the Metrology Monitor. Place the windows above the TV windows for each scope you are using. They should show white sine waves that are around the height of the window. Erratic, fluctuating waves indicate self-interference or a weak signal. This may cause the carts to lose their place as the signal strength falls too low. Red waves indicate that some displayed signal has gone too low and the carts will all need to be homed. A careful adjustment of the MET2 mirror can sometimes bring the signal back. Do not adjust the MET1 mirror.
+  *
-  * To home the carts, turn off the [OL] and [MAN] buttons on each cart and it will automatically return to the front switch. If the cart has no issue, it will arrive at the target position of 0m and the home switch at the same time. The X in the OPLE server under the HM will indicate it has stopped on the home switch. If a cart does not reach the home switch when it returns to position 0m, it was lost and likely the cause of the difficulty in finding fringes. The X does not guarantee the cart has retained its home position. This home position can be checked by using the CHECK button on the ople gui. When a low error value is displayed on the ople server, click on the [OL] and [MAN] or [FT] buttons and hit [TRACK] to send the cart to the desired cart position.
+To home the carts, turn off the [OL] and [MAN] buttons on each cart and it will automatically return to the front switch. If the cart has no issue, it will arrive at the target position of 0m and the home switch at the same time. The X in the OPLE server under the HM will indicate it has stopped on the home switch. If a cart does not reach the home switch when it returns to position 0m, it was lost and likely the cause of the difficulty in finding fringes. The X does not guarantee the cart has retained its home position. This home position can be checked by using the CHECK button on the ople gui or by typing the command “homechk S1” into the ople server. When the error value is displayed on the ople server, hit ESC to clear the display. Click on the [OL] and [MAN] buttons and hit [TRACK] to send the cart to the desired cart position.
+==== Metrology ====
+  *
+Good metrology signals are important to the proper positioning of the carts. Monitor the signal strength by running [RUN MULTIPLE] on the Metrology Monitor. Place the windows above the TV windows for each scope you are using. They should show white sine waves that are around the height of the window. Erratic, fluctuating waves indicate self-interference or a weak signal. This may cause the carts to lose their place as the signal strength falls too low. Red waves indicate that some displayed signal has gone too low and the carts will all need to be homed. A careful adjustment of the MET2 mirror can sometimes bring the signal back. Do not adjust the MET1 mirror
+Steps for adjusting MET2:
+  - Looking at the met signal while the cart is at the back.
+  - Peak so that the beam is aligned as well as possible. Does not need to be perfect but not loose.
+  - All beams have a signal between 1-2 volts while at the back. Sometimes the signal strength can change for no apparent reasons.
+  - Using steps of 50, try moving 3 times in one direction. After each step, wait 5 seconds or so for things to update. If nothing then try the other way.
+  - Return to starting position.
+  - Repeat for the other axis.
 ===== Beam Samplers =====

The CHARA Array Wiki

User Tools

Site Tools

Differences

Page Tools