From 1037354e8b4c7b0f267c66b1be54478195b964c6 Mon Sep 17 00:00:00 2001
From: "Eugeniy E. Mikhailov" <evgmik@gmail.com>
Date: Thu, 25 Jul 2024 13:44:05 -0400
Subject: bug fix: memory depth changes only if Rigol scope in not STOP state

---
 qolab/hardware/scope/rigolds1054z.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/qolab/hardware/scope/rigolds1054z.py b/qolab/hardware/scope/rigolds1054z.py
index 53b23e1..1bfe117 100644
--- a/qolab/hardware/scope/rigolds1054z.py
+++ b/qolab/hardware/scope/rigolds1054z.py
@@ -187,7 +187,14 @@ class RigolDS1054z(ScopeSCPI):
         {AUTO|6000|60000| 600000|6000000|12000000}.
         Wherein, 12000000 (pts) is an optional memory depth.
         """
+
+        # memory depth can be changed only when scope is not in STOP state
+        running = self.getRun()
+        if not running:
+            self.setRun(True)
         self.write(f":ACQuire:MDEPth {val}")
+        if not running:  # restore STOP/RUN state
+            self.setRun(False)
 
     @BasicInstrument.tsdb_append
     def getSampleRate(self):
-- 
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